Question
Question 1 The two properties about a set of measurements of a dependent variable that we are most interested in describing are: Question 1 options:
Question 1
The two properties about a set of measurements of a dependent variable that we are most interested in describing are:
Question 1 options:
| frequency and average. |
| average and correlation. |
| central tendency and dispersion. |
| histograms and polygons. |
Question 2
The ________________ is the sum of all the scores divided by the number of scores.
Question 2 options:
| median |
| mean |
| mode |
| standard deviation |
Question 3
The generally preferred measure of central tendency is usually the
Question 3 options:
| range
|
| mean
|
| standard deviation
|
| median
|
Question 4
Which of the following is the most useful descriptive statistic for measuring dispersion?
Question 4 options:
| range |
| variance |
| mean deviation |
| standard deviation |
Question 5
The standard deviation is
Question 5 options:
| the square of the variance. |
| the square root of the variance. |
| smaller than the mean. |
| the difference between the highest and lowest scores. |
Question 6
If the mean I.Q. is 100 and the standard deviation of I.Q. scores is 15, then an I.Q. of 130 will have a z score (or standard score) of
Question 6 options:
| 1.00 |
| 0.00 |
| 2.00 |
| -2.00 |
Question 7
Inferential statistics allow you to decide whether a difference between the experimental and the control group is due to _______________ or ________________.
Question 7 options:
| manipulation; chance |
| manipulation; experimental error |
| sampling error; independent variable |
| independent variable; experimental error |
Question 8
The null hypothesis suggests that the two samples come from ___________ distribution(s), and the experimental hypothesis suggests that the two samples come from _____________ distribution(s).
Question 8 options:
| different; different |
| different; the same |
| the same; different |
| the same; the same |
Question 9
The power of a statistical test refers to its ability to
Question 9 options:
| reject false null hypotheses. |
| reject false experimental hypotheses. |
| reject true null hypotheses. |
| reject true experimental hypotheses. |
Question 10
Simple analysis of variance is used in designs having
Question 10 options:
| one independent variable |
| more than one independent variable |
| more than one independent variable (IV) but less than four IVs |
| more than one dependent variable |
Question 11
The number of participants in a study is denoted by
Question 11 options:
| s. |
| n. |
| z. |
| r. |
Question 12
A _____________ is a complete set of measurements.
Question 12 options:
| sample |
| population |
| random sampling |
| parameter |
Question 13
_____________ is one way of ensuring that a sample is representative of the population.
Question 13 options:
| The two-tailed test |
| The between-subjects design |
| The sign test |
| Random sampling |
Question 14
If we conduct an experiment on average young, white, college males, inferential statistics allow us to generalize to the population of
Question 14 options:
| average young, white, college males. |
| college male students. |
| college students. |
| young adults. |
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Question 15
If we apply an alpha level of .05, and there really is no effect of the experimental manipulation, then one should make
a Type I error
Question 15 options:
| 5% of the time. |
| 10% of the time. |
| 15% of the time. |
| 95% of the time. |
Question 16
Which of the following would be considered the most conservative alpha level?
Question 16 options:
| .01 |
| .05 |
| .10 |
| .15 |
Question 17
The prediction that alcohol slows reaction time is
Question 17 options:
| nondirectional. |
| directional. |
| semidirectional. |
| partially directional. |
Question 18
Two-tailed tests are _______________ conservative and ______________ powerful than one-tailed tests.
Question 18 options:
| less; less |
| less; more |
| more; less |
| more; more |
Question 19
The _____________ indicates the number of scores that are free to vary.
Question 19 options:
| U |
| degrees of freedom |
| magnitude of effect |
| point biserial |
Question 20
The ____________ is used to analyze the results when there are more than two groups.
Question 20 options:
| t-test |
| z-test |
| analysis of variance |
| none of the above |
Question 21
The __________ maintains that two conditions do not differ.
Question 21 options:
| experimental hypothesis |
| level of confidence |
| law of effect |
| null hypothesis |
Question 22
A conservative statistical test is one that
Question 22 options:
| minimizes both Type I and Type II errors. |
| minimizes Type I errors, but increases the chance of Type II errors. |
| minimizes Type II errors, but increases the chance of Type I errors. |
| increases the chance of both Type I and II errors. |
Question 23
What are inferential statistics used for?
Question 23 options:
| summarize the mean and standard deviation of the data |
| estimate if differences between groups are by chance |
| describe the data from 2 unrelated groups |
| describe the relationship within a set of data |
Question 24
Descriptive statistics are used to:
Question 24 options:
| compare the signficance of the difference between 2 data sets |
| test the difference between the means |
| describe the observations |
| describe the type one error in an experiment |
Question 25
Which of the following is not a characteristic of the normal curve:
Question 25 options:
| bell-shaped |
| represents 100% of the scores under the curve |
| 100 is at the center |
| allows us to determine rank |
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