A sample of n = 16 scores is selected from a population withm= 80 withs= 20. On average, how much error would be expected between the sample mean and the population mean?

20 points

5 points

4 points

1.25 points

Flag this Question Question 21pts For a population with = 80 and = 20, the distribution of sample means based on n = 16 will have an expected value of ____ and a standard error of ____.

5; 80

80; 5

20; 20

80; 1.25

Flag this Question Question 31pts A random sample of n = 4 scores is obtained from a normal population with = 20 ands= 4. What is the probability that the sample mean will be greater than M = 22?

0.50

1.00

0.1587

0.3085

Flag this Question Question 41pts What symbol is used to identify the standard error of M?

s_M

s

M_M

Flag this Question Question 51ptsSkip to question text. A sample of n = 4 scores is obtained from a population withm= 70 ands= 8. If the sample mean corresponds to a z-score of 2.00, then what is the value of the sample mean?

M = 86

M = 78

M = 74

M = 72

Flag this Question Question 61pts If a sample of n = 4 scores is obtained from a population withm= 70 ands= 12, then what is the z-score corresponding to a sample mean of M = 76?

z = 0.25

z = 0.50

z = 1.00

z = 2.00

Flag this Question Question 71pts A sample of n = 9 scores is obtained from a population withm= 70 ands= 18. If the sample mean is M = 76, then what is the z-score for the sample mean?

z = 0.33

z = 0.50

z = 1.00

z = 3.00

Flag this Question Question 81pts If random samples, each with n = 36 scores, are selected from a normal population with = 80 ands= 18, how much difference, on average, should there be between a sample mean and the population mean?

2 points

3 points

6 points

18 points

Flag this Question Question 91pts If samples are selected from a normal population, the distribution of sample means will also be normal.

true

false

Flag this Question Question 101pts As the sample size increases, the standard error also increases.

true

false

Question 11pts A set of 10 scores has SS = 90. If the scores are a sample, the sample variance is ____ and if the scores are a population, the population variance is ____.

Question 11pts A normal distribution has a mean of = 40 with = 10. What proportion of the scores in this distribution are greater than X = 55?

0.3085

0.6915

0.0668

0.9332

Flag this Question Question 21pts A vertical line is drawn through a normal distribution at z = 0.50, and separates the distribution into two sections. What proportion of the distribution is in the larger section?

0.6915

0.3085

0.1915

0.3830

Flag this Question Question 31pts A normal distribution has a mean of = 70 withs= 12. If one score is randomly selected from this distribution, what is the probability that the score will be greater than X = 58?

0.8413

0.1577

0.3413

0.6826

Flag this Question Question 41pts A jar contains 10 red marbles and 30 blue marbles. What is the probability of randomly selecting a red marble from the jar?

10/30

10/40

1/10

1/40

Flag this Question Question 51pts What proportion of a normal distribution is located in the tail beyond z = 2.00?

0.9772

0.0228

0.4772

0.0456

Flag this Question Question 61pts What is the probability of randomly selecting a z-score less than z = 1.25 from a normal distribution.

0.8944

0.1056

0.3944

0.2112

Flag this Question Question 71pts When the z-score value in a normal distribution is negative, the body is on the right-hand side of the distribution.

true

false

Flag this Question Question 81pts A normal distribution has a mean of = 80 withs= 20. What score separates the highest 40% of the distribution from the rest of the scores?

X = 75

X = 85

X = 54.4

X = 105.6

Flag this Question Question 91pts All probabilities can be expressed as decimal values ranging from 0 to 1.00.

true

false

Flag this Question Question 101pts For a binomial distribution, the probability of obtaining a score of X = 19 or greater is computed as p(X > 18.5).

true

false

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Question 11pts A set of 10 scores has SS = 90. If the scores are a sample, the sample variance is ____ and if the scores are a population, the population variance is ____.

s²= 9;s²= 10

s²= 10;s²= 9

s²= 9;s²= 9

s²= 10;s²= 10

Flag this QuestionQuestion 21pts What is the value of SS (sum of squared deviations) for the following population?

Population: 1, 1, 1, 5

12

28

7

3

Flag this QuestionQuestion 31pts A population of N = 100 scores has = 30 ands= 4. What is the population variance?

4

16

2

8

Flag this QuestionQuestion 41pts Which of the following symbols identifies the population standard deviation?

²

s

s²

Flag this QuestionQuestion 51pts A population has = 50 ands= 5. If 10 points are added to every score in the population, then what are the new values for the mean and standard deviation?

= 60 ands= 5

= 50 ands= 5

= 60 ands= 15

= 50 ands= 15

Flag this QuestionQuestion 61pts A sample of n = 9 scores has a variance of s²= 18. If the scores were a population, what value would be obtained for the population variance?

s²= 144

s²= 14

s²= 24

s²= 16

Flag this QuestionQuestion 71pts A population of scores has = 50 ands= 5. If every score in the population is multiplied by 3, then what are the new values for the mean and standard deviation?

= 50 ands= 5

= 150 ands= 15

= 50 ands= 15

= 150 ands= 5

Flag this QuestionQuestion 81pts On an exam with a mean ofm= 70, you have a score of X = 75. Which of the following values for the standard deviation would give you the highest position within the class?

s= 5

It cannot be determined from the information given.

s= 1

s= 10

Flag this QuestionQuestion 91pts If the population variance is 4, then the standard deviation will bes= 16.

true

false

Flag this QuestionQuestion 101pts For a population with = 70 ands= 5, about 95% of the individuals will have scores between X = 65 and X = 75.

false

true

s²= 9;s²= 10

s²= 10;s²= 9

s²= 9;s²= 9

s²= 10;s²= 10

Flag this QuestionQuestion 21pts What is the value of SS (sum of squared deviations) for the following population?

Population: 1, 1, 1, 5

12

28

7

3

Flag this QuestionQuestion 31pts A population of N = 100 scores has = 30 ands= 4. What is the population variance?

4

16

2

8

Flag this QuestionQuestion 41pts Which of the following symbols identifies the population standard deviation?

²

s

s²

Flag this QuestionQuestion 51pts A population has = 50 ands= 5. If 10 points are added to every score in the population, then what are the new values for the mean and standard deviation?

= 60 ands= 5

= 50 ands= 5

= 60 ands= 15

= 50 ands= 15

Flag this QuestionQuestion 61pts A sample of n = 9 scores has a variance of s²= 18. If the scores were a population, what value would be obtained for the population variance?

s²= 144

s²= 14

s²= 24

s²= 16

Flag this QuestionQuestion 71pts A population of scores has = 50 ands= 5. If every score in the population is multiplied by 3, then what are the new values for the mean and standard deviation?

= 50 ands= 5

= 150 ands= 15

= 50 ands= 15

= 150 ands= 5

Flag this QuestionQuestion 81pts On an exam with a mean ofm= 70, you have a score of X = 75. Which of the following values for the standard deviation would give you the highest position within the class?

s= 5

It cannot be determined from the information given.

s= 1

s= 10

Flag this QuestionQuestion 91pts If the population variance is 4, then the standard deviation will bes= 16.

true

false

Flag this QuestionQuestion 101pts For a population with = 70 ands= 5, about 95% of the individuals will have scores between X = 65 and X = 75.

false

true

Question 11pts A population of N = 6 scores hasSX = 30. What is the population mean?

5

15

30

180

Flag this QuestionQuestion 21pts A population has a mean of = 30. If 3 points are added to each score, what is the mean for the new distribution?

33

It cannot be determined from the information given.

27

30

Flag this QuestionQuestion 31pts For a negatively skewed distribution with a mean of M = 20, what is the most probable value for the median?

greater than 20

less than 20

It cannot be determined from the information given.

20

Flag this QuestionQuestion 41pts What is the mean for the following sample of scores?

Scores: 1, 4, 5, 10

20

10

5

4

Flag this QuestionQuestion 51pts A population of scores has a mean of = 26, a median of 23, and a mode of 22. What is the most likely shape for the population distribution?

symmetrical

It cannot be determined from the information given.

negatively skewed

positively skewed

Flag this QuestionQuestion 61pts A sample with a mean of M = 20 hasSX = 120. There are n = 6 scores in the sample.

false

true

Flag this QuestionQuestion 71pts For a set of scores measured on an ordinal scale, the median is the preferred measure of central tendency.

true

false

Flag this QuestionQuestion 81pts A sample has n = 5 scores: 2, 4, 5, 8, and 11. The median for the sample is 6.5.

true

false

Flag this QuestionQuestion 91pts A distribution of scores has a mean of 50, a median of 53, and a mode of 56. Based on this information it appears that the distribution is negatively skewed.

true

false

Flag this QuestionQuestion 101pts The mean is considered to be the balance point for a distribution because exactly half of the scores are located above the mean and exactly half are below the mean.

true

false

On a multiple-choice exam for which each question has four possible answers, the probability of guessing the correct answer is p = 1/4. What is the mean of the binomial distribution for the number of correct guesses for a series of 100 questions?

5

25

10

50

Flag this QuestionQuestion 21pts Which of the following is true for any binomial test?

p = q

p > q

(p)(q) = 1.00

p + q = 1.00

Flag this QuestionQuestion 31pts For a binomial distribution with p = 0.10 and n = 100, what is the range of possible values for X?

0 to 1

0 to 100

1 to 100

0.01 to 0.09

Flag this QuestionQuestion 41ptsSkip to question text. A researcher is testing a null hypothesis stating that for the general population there is no preference between the two leading brands of cola. In a sample of n = 100 people, 35 preferred brand A and 65 preferred brand B. Assuming that the researcher uses a two-tailed test, what is the appropriate statistical decision?

Reject the null hypothesis witha= .05 but not witha= .01.

Reject the null hypothesis with eithera= .05 ora= .01.

Fail to reject the null hypothesis with eithera= .05 ora= .01.

No decision is possible without additional information.

Flag this QuestionQuestion 51pts For a binomial distribution with p = 1/2 and n = 30, the value of X ranges from 1 to 30.

true

false

Flag this QuestionQuestion 61pts For a binomial distribution based on n = 100, the standard deviation would be larger for p = 0.90 than for p = 0.80.

true

false

Flag this QuestionQuestion 71pts For the normal approximation to the binomial distribution with p = 1/2 and n = 100, what is the z-score corresponding to X = 60?

z = 10/25

z = 10/5

z = 5/25

z = 5/5

Flag this QuestionQuestion 81pts Which of the following tests is often used for the same kind of research study for which the sign test is appropriate?

An independent-measures t test

A repeated-measures t test

A Pearson correlation

A chi-square test for goodness of fit

Flag this QuestionQuestion 91pts The binomial distribution with p = .10 has a mean ofm= 10. For this distribution, there are n = 100 scores in the sample.

true

false

Flag this QuestionQuestion 101pts If other factors are held constant, both the mean and standard deviation for the binomial distribution will both increase as the sample size increases.

true

false