Answer the following True/False, Multiple Choice, Fill in blank as QUICKLY AS POSSIBLE*. Please let them be correct answers. No explanation needed.

1 When conducting a one-sample t test, if a sample size is 10, the denominator used in the formula to estimate the population standard deviation would be equal to:

Group of answer choices

0

N-1

N

the square root of N

If a psychologist tests whether a new teaching method is more effective than the old one, the research hypothesis is that:

Group of answer choices

the new teaching method is more effective than the old teaching method

there is no difference in effectiveness of the old and new teaching methods

the old teaching method is more effective than the new teaching method

there is a difference in effectiveness between the two methods, but no prediction is made

A psychologist who rejects the null hypothesis because the probability of obtaining the results if the null hypothesis is true is 4% would express this finding when writing up the results in a research article as:

Group of answer choices

Type I<.05

prob.<5%

Rejection rate=.04

p<.05

A personnel psychologist has to decide which of three employees to place in a particular job that requires a high level of coordination. All three employees have taken tests of coordination, but each took a different test. Employee A scored 11 on a test with a mean of 10 and a standard deviation of 2; Employee B scored 325 on a test with a mean of 300 and a standard deviation of 40; and Employee C scored 116 on a test with a mean of 100 and a standard deviation of 16. (On all three tests, higher scores mean greater coordination.)What is Employee B's Z score?

Group of answer choices

0

-.63

.63

1.6

A researcher conducts a study in which participants are asked about their exercise habits. The participants are asked the types of exercise they engage in, the number of times they exercise per week, and how they compare with the rest of their immediate family in terms of how much they exercise. In this scenario, the type of exercise engaged in is a:

Group of answer choices

rank-order variable

ordinal variable

ratio variable

nominal variable

All of the following are frequently reported for a chi-square for goodness of fit test in a research article EXCEPT:

Group of answer choices

the number of people in each category

or Cramer's

some description of the basis for determining the expected frequencies

the expected frequencies

In a one-way between-subjects ANOVA with equal sample sizes, the within-groups variance estimate is calculated by taking the __________ of the sample variances.

If the mean score on a stress scale is 5, the standard deviation is 2, and the distribution is normal, the approximate percentage of people who would obtain scores between 3 and 5 is:

Group of answer choices

68%

48%

34%

50%

The most likely way for the results of a t test to be presented in a research article for a study with a sample of 24 participants is:

Group of answer choices

t(23) = 2.94, p<.05

t(24) = 3.01, p<.05

t(23) is less than .05

t(24) is significant

For the following problem, please round to two decimal places:

Using a linear prediction rule in which a=16.38 and b=3.33, if an individual's score on X is 12, the predicted score for Y is:

The generally accepted cutoff points, or conventional levels of significance, in hypothesis testing in psychology are:

Group of answer choices

.001 and .01

.01 and .05

.05, .25, and .95

.10, .20., and .30

For the following problem, please round to two decimal places:

If the regression constant is 8.58 and the regression coefficient is 2.44, the predicted score for a person with a predictor variable score of 2.69 is:

If the correlation between two personality traits is -.07, the correlation is considered a:

Group of answer choices

weak positive linear correlation

strong negative linear correlation

weak negative linear correlation

strong positive linear correlation

The alpha level is:

Group of answer choices

the probability of a Type I error

determined after analyzing experimental data

the chance of obtaining an inconclusive result when the research hypothesis is true

the probability of a Type II error

A psychologist studying cultural diversity who conducts a few lengthy interviews with members of various cultural communities is using a:

Group of answer choices

behavioral technique

positivistic technique

qualitative technique

quantitative technique

Consider this data set: 2, 4, 9, 7, 2, 3, 5, 8, 8, 8. In this data set, 8 is the:

Group of answer choices

mean

median

mode

standard deviation

A graph that shows the pattern of the relation of two variables is a:

Group of answer choices

box plot

frequency polygon

histogram

scatter diagram (scatter plot)

A forensic psychologist conducted a study to examine whether being hypnotized during recall affects how well a witness can remember facts about an event. Ten participants watched a short film of a mock robbery, after which each participant was questioned about what he or she had seen. The five participants in the experimental group were questioned while they were hypnotized and gave a mean of 20 accurate responses (S²=10). The five participants in the control group gave a mean of 18 accurate responses (S²=5). Using the .05 significance level, test whether hypnotized witnesses perform differently than witnesses who are not hypnotized.

What is the null hypothesis?

Group of answer choices

Hypnotized witnesses perform better than witnesses who are not hypnotized

Hypnotized witnesses perform differently than witnesses who are not hypnotized

Hypnotized witnesses perform worse than witnesses who are not hypnotized

Hypnotized witnesses do not perform differently than witnesses who are not hypnotized

A new school district superintendent preparing to reallocate resources for physically impaired students wanted to know if the schools in the district differed in the distribution of physically impaired. The superintendent tested samples of 20 students from each of the five schools and found 5 physically impaired (and 15 unimpaired) students at School 1, 5 physically impaired (and 15 unimpaired) at School 2, 6 (and 14) at School 3, 4 (and 16) at School 4, and 7 (and 13) at School 5. Using the .05 significance level, test whether the distribution of physically impaired students is different at different schools.What is the correct cutoff?

Group of answer choices

7.815

9.211

9.488

13.277

For the following problem, please round to two decimal places:

A consumer psychologist asked to test a claim by a swimming school that its instructors could teach the average seven-year-old to swim across an Olympic-sized pool in less than 121 seconds. The psychologist arranged for 9 randomly selected seven-year-old children to take lessons at the school and recorded how long it took each child to swim across a pool at the end of the lessons. The mean time (in seconds) for the 9 children was 126 and the standard deviation was 13. Conduct a t test for a single sample using 121 seconds as the "known" population mean and the .05 significance level.What is the correct value for t?

The conventional levels of significance of 5% and 1%:

Group of answer choices

are more related to power and sample size considerations than decision errors

are considered reasonable compromises between the risk of making Type I and Type II errors

provide maximum protection against Type I errors

provide maximum protection against Type II errors

If a research article reports that, "The mean performance scores for the Normal Sleep, Reduced Sleep, and No Sleep groups were 18.0, 16.6, and 15.6, respectively, F(2, 36) = 2.95, p < .05," what should the researcher conclude?

Group of answer choices

people who get no sleep perform worse than those who sleep a normal amount

people who sleep a reduced amount perform significantly worse than people who sleep a normal amount

there is a difference among the three means

people who get no sleep perform significantly worse than people who sleep a reduced amount

A consumer psychologist asked to test a claim by a swimming school that its instructors could teach the average seven-year-old to swim across an Olympic-sized pool in less than 2 minutes. The psychologist arranged for 9 randomly selected seven-year-old children to take lessons at the school and recorded how long it took each child to swim across a pool at the end of the lessons. The mean time (in seconds) for the 9 children was 110 and the standard deviation was 15. Conduct a t test for a single sample using 120 seconds as the "known" population mean and the .05 significance level. What is the research hypothesis?

Group of answer choices

The swimming school's instructors can teach the average seven-year-old child to swim across an Olympic-sized pool in a time that is not 2 minutes

The swimming school's instructors can teach the average seven-year-old child to swim across an Olympic-sized pool in more than 2 minutes

The swimming school's instructors can not teach the average seven-year-old child to swim across an Olympic-sized pool in less than 2 minutes

The swimming school's instructors can teach the average seven-year-old child to swim across an Olympic-sized pool in less than 2 minutes

The probability of failing to reject the null hypothesis when the null hypothesis is actually true (and the research hypothesis is false) is equal to:

Group of answer choices

1 minus alpha

1 minus beta

alpha

beta

An experimental psychologist interested in whether the color of an animal's surroundings affects learning rate tests 9 rats in a box with colorful wallpaper. The average rat of this strain can learn to run this type of maze in a box without any special coloring in 23 trials, with a variance of 16 and the distribution is normal. The mean number of trials to learn the maze for the rats tested with the colorful wallpaper is 25.

What is _M?

Group of answer choices

1.33

.44

1.78

5.33

In an analysis of variance, if the within-group variance estimate is smaller than the between-group variance estimate, then:

Group of answer choices

any difference between sample means is probably due to random sampling error

any difference between sample means is probably not due to a real difference caused by experimental conditions

an error has been made in computing the between-groups and the within-groups variance estimates

the null hypothesis should be rejected

A researcher wants to compare how participants have a memory test under two conditions: The first group of 10 participants completes the task while sitting down. The second group of participants completes the task while lying down. The appropriate test to use to analyze the data from this experiment is the:

Group of answer choices

repeated measures ANOVA

t test for dependent means

t test for independent means

single sample t test

When carrying out a t test for independent means:

Group of answer choices

the null hypothesis is not rejected if the computed t score is less extreme than the cutoff t score

the medians of the two populations are assumed to be equal

the null hypothesis is rejected if the computed t score is less extreme than the cutoff t score

only the .10 significance level should be used because of the assumption that the variances of the two distributions should be equal

For the following problem, please round to two decimal places:

A teacher rated the reading ability level of eight fourth grade children in a special math program. The reading level ratings were as follows: 3, 6, 3, 10, 8, 6, 9, 8. Compute the mean.

Which of the following is true for the t test for independent means?

Group of answer choices

population variances are estimated from the information in the samples being studied

the cutoffs are always the same as those for the z distribution

pretest-posttest experimental designs are common

a difference score is calculated for each participant

An experimental psychologist interested in whether the color of an animal's surroundings affects learning rate tests 9 rats in a box with colorful wallpaper. The average rat of this strain can learn to run this type of maze in a box without any special coloring in 23 trials, with a variance of 16 and the distribution is normal. The mean number of trials to learn the maze for the rats tested with the colorful wallpaper is 25.If the mean score of the sample is more extreme than the cutoff score on the comparison distribution, the psychologist will conclude that:

Group of answer choices

the wallpaper did not have a significant effect on the rate of learning

the results are inconclusive since the null hypothesis cannot be rejected

the color of the chamber had a significant effect on the rate of learning

the null hypothesis that the rats in the sample will learn more is supported

Using a normal curve table, if a person has a score of 4.78 on a test, which equals a Z score of +3.5, the percentage of cases that lie above this score is:

Group of answer choices

100%

3.50%

.02%

49.98%

If two people in a group of 14 people were born in Iowa, the chance of randomly selecting someone from the group who was born in Iowa is:

Group of answer choices

0

.14

.17

14

Given an alpha of .05, a two-tailed test is __________ than a one-tailed test

Group of answer choices

less conservative

more conservative

The results of an analysis of variance would be reported in a research article as:

Group of answer choices

F(2, 44) = 3.40, p < .05

F(44) = 3.40, significant

F = 3.40, p < .05

F(2, 44)

A forensic psychologist conducted a study to examine whether being hypnotized during recall affects how well a witness can remember facts about an event. Ten participants watched a short film of a mock robbery, after which each participant was questioned about what he or she had seen. The five participants in the experimental group were questioned while they were hypnotized and gave a mean of 20 accurate responses (S²=10). The five participants in the control group gave a mean of 18 accurate responses (S²=5). Using the .05 significance level, test whether hypnotized witnesses perform differently than witnesses who are not hypnotized.

What is the correct decision and conclusion?

Group of answer choices

Do not reject the null hypothesis; Conclude that hypnotized witnesses do not perform differently than witnesses that are not hypnotized

Do not reject the null hypothesis; Conclude that hypnotized witnesses do perform differently than witnesses that are not hypnotized

Reject the null hypothesis; Conclude that hypnotized witnesses do not perform differently than witnesses that are not hypnotized

Reject the null hypothesis; Conclude that hypnotized witnesses do perform differently than witnesses that are not hypnotized

Consider this data set: 2, 4, 9, 7, 2, 3, 5, 8, 8, 8. What is the median?

Group of answer choices

5

8

5.6

6

When drawing a regression line for a linear prediction rule, the minimum number of predicted points on a graph that must be located is:

Group of answer choices

2 if it is a positively sloped line; 1 if it is a negatively sloped line

1 if it is a positively sloped line; 2 if it is a negatively sloped line

1

2

A forensic psychologist conducted a study to examine whether being hypnotized during recall affects how well a witness can remember facts about an event. Ten participants watched a short film of a mock robbery, after which each participant was questioned about what he or she had seen. The five participants in the experimental group were questioned while they were hypnotized and gave a mean of 20 accurate responses (S²=10). The five participants in the control group gave a mean of 18 accurate responses (S²=5). Using the .05 significance level, test whether hypnotized witnesses perform differently than witnesses who are not hypnotized.

What is the correct cutoff(s)?

Group of answer choices

2.306

2.447

1.860

1.943

If a student who wants to study alcohol use at a high school obtains a complete list of the students and has a blindfolded person select as many people as needed for the study, the student is conducting:

Group of answer choices

haphazard selection

quota selection

random selection

specified selection

41 A scatter diagram in which the pattern of dots generally goes up and to the right is indicating a(n) ____ correlation.

42A study is done in which a researcher collects data on which cell phone company students have a contract with. Afterwards, the number of students who have contracts with each cell phone company is shown on a frequency graph. The researcher is using:

Group of answer choices

an inferential statistical method

a measure of central tendency

a descriptive statistical method

an intuitive statistical method

43A graphic display of the pattern of relationship between two variables is a(n) ____

44 For the following problem, please round to two decimal places:

An experimenter who has conducted an analysis of variance involving 6 groups that led you to rejecting the null hypothesis wants to know which of the groups are different from each other. If the experimenter decides to conduct 6 t tests, each at the .05 level of significance, what are the approximate chances that at least one of those t tests will produce a significant result, even if the groups being compared really do come from populations with the same mean? Give your answer as a probability (answer should be between 0 and 1)

45

When figuring a correlation coefficient, each individual's Z score on one variable is multiplied by the individual's Z score on the other variable because the result will always be:

Group of answer choices

positive if the individual has high scores on both variables

negative if the individual has low scores on both variables

smaller as the variance of the scores on each variable becomes smaller

positive if the individual has a high score on one variable and a low score on the other variable

46An experimental psychologist interested in whether the color of an animal's surroundings affects learning rate tests 9 rats in a box with colorful wallpaper. The average rat of this strain can learn to run this type of maze in a box without any special coloring in 23 trials, with a variance of 16 and the distribution is normal. The mean number of trials to learn the maze for the rats tested with the colorful wallpaper is 25. What is the research hypothesis?

Group of answer choices

The rate of learning for the rats tested with colorful wallpaper will be slower than the population of rats tested under ordinary circumstances

The rate of learning for the rats tested with colorful wallpaper will be different than the population of rats tested under ordinary circumstances

The rate of learning for the rats tested with colorful wallpaper will be faster than the population of rats tested under ordinary circumstances

The rate of learning for the rats tested with colorful wallpaper will be no different than the population of rats tested under ordinary circumstances

A new school district superintendent preparing to reallocate resources for physically impaired students wanted to know if the schools in the district differed in the distribution of physically impaired. The superintendent tested samples of 20 students from each of the five schools and found 5 physically impaired (and 15 unimpaired) students at School 1, 5 physically impaired (and 15 unimpaired) at School 2, 6 (and 14) at School 3, 4 (and 16) at School 4, and 7 (and 13) at School 5. Using the .05 significance level, test whether the distribution of physically impaired students is different at different schools.Figure the chi-square for this data set yourself (round to two decimal places). What is the chi-square obtained?

If you want to use the one-sample t test to analyze data from a pretest/posttest type of study, you first have to find the difference between the:

Group of answer choices

Z scores

y intercepts

mean from sample one and the mean from sample two

pretest and posttest scores for each participant

A regression coefficient indicates:

Group of answer choices

the fixed amount that should be added when making a prediction for any particular person

how many units of change in the predicted value of the criterion variable for each unit of change in the predictor variable

the accuracy of predictions based on the reduction in squared error as a proportion of the total squared error

whether the correlation is significant or not

Using a normal curve table, if a person received a test score that was in the top 33% of everyone who took the test, the person's Z score must be at least:

Group of answer choices

.95

.52

.44

.33

In a histogram, the horizontal dimension shows:

Group of answer choices

the percentage of cases

the possible values the variable can have

the correlation

the frequency

When the dots on a scatter diagram seem to form a straight line that goes downward to the right, the dots indicate:

Group of answer choices

a positive linear correlation

no correlation

a negative linear correlation

a curvilinear correlation

The decision to reject the null hypothesis using the Z test is made:

Group of answer choices

if the Z score is less than -1 or greater than +1

if the Z score is greater than +2.5

by comparing the standard deviation of the sample (SD) to the standard deviation of the population ()

by comparing the Z score needed to reject the null hypothesis to the actual Z score of the sample

During an experiment, participants measure of spatial ability twice. The first time is under normal non-stressed conditions and the second time is while the participants are under extreme stress. The appropriate test to use to analyze the data is:

Group of answer choices

a t test for dependent means

a two sample t test

a between groups ANOVA

a t test for independent means

If the results of a study using a t test for dependent means are reported in a research article as "t(16) = 2.67, p<.05"

Group of answer choices

the t score was .05

there were 16 participants

the result is not significant

the result is significant

Using a normal curve table, if a person has a score in the bottom 9% of all scores in a distribution, the highest Z score this person can have is:

Group of answer choices

+.23

1.34

-.23

-1.34

Under what conditions can the possibility that X causes Y be ruled out when two variables, X and Y, are strongly correlated?

Group of answer choices

if Y occurs before X

if the correlation is positive

if X occurs before Y

if the correlation is negative

For the following problem, please round to two decimal places:

If the standard deviation is 15.17, the variance is:

According to the Central Limit Theorem, the distribution of means is:

Group of answer choices

skewed

U-shaped

bimodal

symmetrical

If a sample includes three individuals with scores of 1, 3, and 5, the estimated population standard deviation is:

Group of answer choices

2

1.63

2.67

1

If the exact degree of difference between two scores has no meaning beyond the fact that one is higher than the other, the level of measurement is:

Group of answer choices

rank-order

equal-interval

nominal

ratio

The two branches of statistical methods are:

Group of answer choices

descriptive and intuitive

intuitive and observational

descriptive and inferential

theoretical and inferential

What is the mean of the scores 0, 0, 0, 2, 5, 6, and 8?

Group of answer choices

2.5

2

3

0

The best linear prediction rule is the one that has the least:

Group of answer choices

least squared error when predicting from the mean

error when predicting using that rule

squared error when predicting using that rule

error when predicting from the mean

A contingency table is a table in which:

Group of answer choices

distributions are translated into t distributions

chi-squares for each category are displayed over each level of the predictor variable

² distributions are translated into F distributions

the distributions of two nominal variables are laid out so that you have the frequencies of their combinations and totals can be seen

A psychologist who states the hypothesis that there will be no difference between a new approach to therapy and the standard approach is stating a:

Group of answer choices

differential hypothesis

research hypothesis

null hypothesis

comparison hypothesis

In an analysis of variance, if F<.05, then:

Group of answer choices

the null hypothesis should not be rejected

the null hypothesis should be rejected

the research hypothesis is most likely true

the between-groups variance estimate must be larger than the within-groups estimate

If the study has a low level of power,

Group of answer choices

the null hypothesis will almost certainly be rejected

the chances of getting a significant result are high

the chances of getting a significant result are low

beta is necessarily low

According to the Central Limit Theorem, the mean of the distribution of means is:

Group of answer choices

the sample mean multiplied by the variance

the original population mean divided by the sample size

the square-root of the original population mean

the same as the original population mean

When is the correlation coefficient equal to -1.00?

Group of answer choices

It is never zero

When there is a perfect negative linear correlation

When there is a perfect positive linear correlation

When there is no linear correlation

A teacher rated the reading ability level of eight fourth grade children in a special math program. The reading level ratings were as follows: 2, 3, 3, 4, 3, 5, 1, 6.Compute the standard deviation.

Group of answer choices

0

1.60

1.50

1.40

PreviousNext

A personnel psychologist has to decide which of three employees to place in a particular job that requires a high level of coordination. All three employees have taken tests of coordination, but each took a different test. Employee A scored 11 on a test with a mean of 10 and a standard deviation of 2; Employee B scored 325 on a test with a mean of 300 and a standard deviation of 40; and Employee C scored 116 on a test with a mean of 100 and a standard deviation of 16. (On all three tests, higher scores mean greater coordination.) Which employee has the best coordination relative to the general performance of other employees who have taken the same test?

Group of answer choices

Employee A

All have the same coordination

Employee C

Employee B

If a regression line goes down one unit for every two it moves across going from left to right, b = ______.

Group of answer choices

-.5

+2.00

-.50

-2.00

-(1/2)

-1/2

+.50

-0.5

In an analysis of variance, if the null hypothesis is true, then the ____ -groups estimate of the population variance should be much smaller tha_____n the -groups estimate

Which of the following can be used to correctly fill in the blank? (You can choose more than one answer.) As ________ increases, power increases

Group of answer choices

beta

alpha

sample size

population variance

effect size

Consider the data set: 2, 4, 5, 5, 6, 9. The variance of this data set is:

Group of answer choices

5.38

2.11

4.45

2.32

The degrees of freedom for the chi-square test for goodness of fit is:

Group of answer choices

the total number of individuals minus the number of categories

the mean number of individuals per category minus the number of categories

the mean number of individuals per category minus one

the number of categories minus one

In a chi-square test, the variables are measured on a:

Group of answer choices

nominal level

interval level

ratio level

ordinal level

"MS_Between" stands for:

Group of answer choices

multiple squared errors between groups

multiple sum errors between groups

mean squares between

mean sums of between-group deviations

A new school district superintendent preparing to reallocate resources for physically impaired students wanted to know if the schools in the district differed in the distribution of physically impaired. The superintendent tested samples of 20 students from each of the five schools and found 5 physically impaired (and 15 unimpaired) students at School 1, 5 physically impaired (and 15 unimpaired) at School 2, 6 (and 14) at School 3, 4 (and 16) at School 4, and 7 (and 13) at School 5. Using the .05 significance level, test whether the distribution of physically impaired students is different at different schools. What is the research hypothesis?

Group of answer choices

The percentage of physically impaired students is lower at School 5 than at School 2

The distribution of physically impaired students is different at different schools

The percentage of physically impaired students is greater at School 1 than at School 2

The distribution of physically impaired students is not different at different schools

Question 811 pts

Setting the significance level cutoff at .01 instead of the more usual .05 increases the likelihood of:

Group of answer choices

rejecting the null hypothesis when, in fact, it is false

rejecting the null hypothesis, when, in fact, it is true

a Type I error

a Type II error

Psychologists use scatterplots (scatter diagrams) to show:

Group of answer choices

the reasoning behind their experiment

the relation between two variables

the mean scores on the dependent variable

the hypotheses they plan to test

The variance of a distribution of differences between means is equal to:

Group of answer choices

the sum of the variances of the two distributions of means

the difference between the variances of the two distributions of means

the sum of the two estimated population variances

the difference between the two estimated population variances

A consumer psychologist asked to test a claim by a swimming school that its instructors could teach the average seven-year-old to swim across an Olympic-sized pool in less than 2 minutes. The psychologist arranged for 9 randomly selected seven-year-old children to take lessons at the school and recorded how long it took each child to swim across a pool at the end of the lessons. The mean time (in seconds) for the 9 children was 110 and the standard deviation was 15. Conduct a t test for a single sample using 120 seconds as the "known" population mean and the .05 significance level.What is the cutoff score(s)?

Group of answer choices

2.228

2.306

-1.860

-1.833

-1.895

In making a prediction using the linear prediction rule, = 7 + (1.28)(X), the "7" is the __________. (Give a name, not a symbol.)

For the chi-square test for independence, the degrees of freedom is equal to:

Group of answer choices

Total number of scores - 1

k (N-1)

df for sample 1 + df for sample 2

(Number of columns - 1)(Number of rows - 1)

For the following problem, please round to two decimal places:

If a person's score on a questionnaire has been found to predict observed social skills, and the linear prediction rule uses a regression constant of 2.57 and a regression coefficient of 0.79, the predicted level of social skills for a person with a score of 38 on the questionnaire is:___

An experimental psychologist interested in whether the color of an animal's surroundings affects learning rate tests 9 rats in a box with colorful wallpaper. The average rat of this strain can learn to run this type of maze in a box without any special coloring in 23 trials, with a variance of 16 and the distribution is normal. The mean number of trials to learn the maze for the rats tested with the colorful wallpaper is 25.

What is the M?

Group of answer choices

9

16

25

23

An experimental psychologist interested in whether the color of an animal's surroundings affects learning rate tests 9 rats in a box with colorful wallpaper. The average rat of this strain can learn to run this type of maze in a box without any special coloring in 23 trials, with a variance of 16 and the distribution is normal. The mean number of trials to learn the maze for the rats tested with the colorful wallpaper is 25.The shape of the distribution of means:

Group of answer choices

will be rectangular

will be flatter than a normal curve

will be normal

will be more spread out then a normal curve

For the following problem, please round to two decimal places:

In an analysis of variance with a between-groups variance estimate of 2.53 and a within-groups estimate of 6.39, the F ratio is:___

When the standard deviation of the original population is small, the experiment tends to:

Group of answer choices

have a higher level of power

have a lower level of power

have a high level of Type II error

show a less significant difference between the two populations

When the standard deviation of the original population is small, the experiment tends to:

Group of answer choices

have a higher level of power

have a lower level of power

have a high level of Type II error

show a less significant difference between the two populations

Which of the following is the best example of restriction in range?

Group of answer choices

when a correlation coefficient is zero

when a researcher correlates SAT scores with high school GPA for students graduating summa cum laude

when a correlation coefficient is negative

when a researcher correlates height and weight

In actual practice, the usual reason for determining power before conducting a study is:

Group of answer choices

to anticipate the likelihood that the experiment will need to be repeated

to determine the number of participants needed to have a reasonable level of power

to eliminate the possibility that a mistake may occur

to ensure that regardless of whether the research hypothesis is true, the experiment will yield a significant result

If most students did very poorly on a statistics test and only a few did very well, including the few who did very well, the distribution of test scores would be:

Group of answer choices

rectangular

symmetrical

positively skewed

negatively skewed

If a counseling psychologist wants to predict college GPA from SAT scores, GPA is the:

Group of answer choices

positive variable

effect variable

predictor variable

criterion variable

The reporting of chi-square tests in research articles:

Group of answer choices

relies exclusively on tables

almost always includes the information needed to repeat the calculation

was emphasized in research articles until recently

has been downplayed until recently

What is the logic behind how a researcher would test whether a new treatment for anxiety works?

Group of answer choices

Try to accept the hypothesis that it does work

Try to accept the hypothesis that it does not work

Try to reject the hypothesis that it does work

Try to reject the hypothesis that it does not work

100Each of several patients is rated for their degree of depression. One patient in particular receives a depression rating of 8 on a 20-point scale. In this scenario, depression is the:

Group of answer choices

frequency

score

variable

mean

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