Question 1

The F statistic is:

Accepted Answer

A)  a nonparametric test 
B)  a ratio of population variances 
C)  [between-groups variance]/[within-groups variance] 
D)  [within-groups variance]/[between-groups variance] 
A)  a nonparametric test 
B)  a ratio of population variances 
C)  [between-groups variance]/[within-groups variance] 
D)  [within-groups variance]/[between-groups variance] C

Question 2

As the sample size increases:

Accepted Answer

A)  the standard error of the mean increases 
B)  the power of a test decreases 
C)  the probability of a type II error decreases 
D)  the probability of a type I error increases 
A)  the standard error of the mean increases 
B)  the power of a test decreases 
C)  the probability of a type II error decreases 
D)  the probability of a type I error increases C

Question 3

Determining p or significance is all that is necessary to decide whether the results of an experiment are meaningful.

Accepted Answer

A) True 
 B)False  False

Question 4

Statistical power increases with sample size.

Accepted Answer

A) True 
 B)False

Question 5

About 68% of all scores lie between -2 and +2 standard deviations in a normal distribution.

Accepted Answer

A) True 
 B)False

Question 6

In a multifactor analysis of variance,how the variables affect one another is called:

Accepted Answer

A)  main effects 
B)  interaction effects 
C)  experimental effects 
D)  variance effects 
E)  a type II error 
A)  main effects 
B)  interaction effects 
C)  experimental effects 
D)  variance effects 
E)  a type II error

Question 7

A conservative statistical test is one that:

Accepted Answer

A)  minimizes both type I and type II errors 
B)  minimizes type I errors but increases type II errors 
C)  minimizes type II errors but increases type I errors 
D)  decreases the chance of type II errors 
E)  always results in both errors increasing 
A)  minimizes both type I and type II errors 
B)  minimizes type I errors but increases type II errors 
C)  minimizes type II errors but increases type I errors 
D)  decreases the chance of type II errors 
E)  always results in both errors increasing

Question 8

The Greek letter sigma ($\sigma$)stands for the sample standard deviation.

Accepted Answer

A) True 
 B)False

Question 9

The magnitude of effect tells us how wrong the null hypothesis is when it has been rejected.

Accepted Answer

A) True 
 B)False

Question 10

In a normal distribution,a score that is one standard deviation above the mean:

Accepted Answer

A)  has a different X value as the point of inflection 
B)  has a z-score of 0 
C)  occurs about as often as the score one standard deviation below the mean 
D)  is higher than about 98 percent of the scores in the distribution 
A)  has a different X value as the point of inflection 
B)  has a z-score of 0 
C)  occurs about as often as the score one standard deviation below the mean 
D)  is higher than about 98 percent of the scores in the distribution

Question 11

Failing to reject the null hypothesis when it is actually false is a:

Accepted Answer

A)  type I error 
B)  type II error 
C)  standard error 
D)  silly 
E)  correct decision 
A)  type I error 
B)  type II error 
C)  standard error 
D)  silly 
E)  correct decision

Question 12

An advantage of the median over the mean is that the median is:

Accepted Answer

A)  easier to calculate 
B)  more sensitive to each of the sample scores 
C)  a measure of dispersion 
D)  less influenced by extreme scores 
E)  often found between the limits of a score 
A)  easier to calculate 
B)  more sensitive to each of the sample scores 
C)  a measure of dispersion 
D)  less influenced by extreme scores 
E)  often found between the limits of a score

Question 13

The variance of a group of scores is just like the absolute mean deviation except that for the variance:

Accepted Answer

A)  the absolute value of the differences is used instead of the squared value 
B)  the squared value of the differences is used instead of the absolute value 
C)  differences are based on the median not on the mean 
D)  differences are based on the mean instead of on the median 
A)  the absolute value of the differences is used instead of the squared value 
B)  the squared value of the differences is used instead of the absolute value 
C)  differences are based on the median not on the mean 
D)  differences are based on the mean instead of on the median

Question 14

If experimental treatments produce an effect:

Accepted Answer

A)  between-groups variance will increase 
B)  between-groups variance will decrease 
C)  within-groups variance will increase 
D)  within-groups variance will stay the same 
A)  between-groups variance will increase 
B)  between-groups variance will decrease 
C)  within-groups variance will increase 
D)  within-groups variance will stay the same

Question 15

The median is preferred to the mean when there are a few extreme scores.

Accepted Answer

A) True 
 B)False

Question 16

The ____ divides a distribution in half.

Accepted Answer

A)  range 
B)  mean 
C)  mode 
D)  median 
E)  dispersion 
A)  range 
B)  mean 
C)  mode 
D)  median 
E)  dispersion

Question 17

One should calculate a measure of magnitude of effect even when the null hypothesis cannot be rejected.

Accepted Answer

A) True 
 B)False

Question 18

The standard deviation is the sum of the squared deviations from the mean,divided by the number of scores.

Accepted Answer

A) True 
 B)False

Question 19

The Mann-Whitney test is a parametric test used to compare two independent samples of scores.

Accepted Answer

A) True 
 B)False

Question 20

Rejecting the null hypothesis when it is actually false is:

Accepted Answer

A)  a type I error 
B)  a type II error 
C)  more likely with two-tailed tests 
D)  an error of chance 
E)  a correct decision 
A)  a type I error 
B)  a type II error 
C)  more likely with two-tailed tests 
D)  an error of chance 
E)  a correct decision

The F statistic is:

As the sample size increases:

Determining p or significance is all that is necessary to decide whether the results of an experiment are meaningful.

Statistical power increases with sample size.

About 68% of all scores lie between -2 and +2 standard deviations in a normal distribution.

In a multifactor analysis of variance,how the variables affect one another is called:

A conservative statistical test is one that:

The Greek letter sigma ( $\sigma$ )stands for the sample standard deviation.

The magnitude of effect tells us how wrong the null hypothesis is when it has been rejected.

In a normal distribution,a score that is one standard deviation above the mean:

Failing to reject the null hypothesis when it is actually false is a:

An advantage of the median over the mean is that the median is:

The variance of a group of scores is just like the absolute mean deviation except that for the variance:

If experimental treatments produce an effect:

The median is preferred to the mean when there are a few extreme scores.

The ____ divides a distribution in half.

One should calculate a measure of magnitude of effect even when the null hypothesis cannot be rejected.

The standard deviation is the sum of the squared deviations from the mean,divided by the number of scores.

The Mann-Whitney test is a parametric test used to compare two independent samples of scores.

Rejecting the null hypothesis when it is actually false is:

Overview of Psychological Research

Explanation in Scientific Psychology

Exploring the Literature of Psychology

Conducting Ethical Research

Observations in Psychological Research

Relational Research

Basics of Experimentation

Validity and Reliability in Psychological Research

Experimental Design

Complex Design

Small-N Experimentation

Quasi-Experimentation

Interpreting the Results of Research

Presenting Research Results

Filters

Exam 15: Appendices a and B Descriptive and Inferential Statistics

The F statistic is:

As the sample size increases:

Determining p or significance is all that is necessary to decide whether the results of an experiment are meaningful.

Statistical power increases with sample size.

About 68% of all scores lie between -2 and +2 standard deviations in a normal distribution.

In a multifactor analysis of variance,how the variables affect one another is called:

A conservative statistical test is one that:

The Greek letter sigma ( σ\sigmaσ )stands for the sample standard deviation.

The magnitude of effect tells us how wrong the null hypothesis is when it has been rejected.

In a normal distribution,a score that is one standard deviation above the mean:

Failing to reject the null hypothesis when it is actually false is a:

An advantage of the median over the mean is that the median is:

The variance of a group of scores is just like the absolute mean deviation except that for the variance:

If experimental treatments produce an effect:

The median is preferred to the mean when there are a few extreme scores.

The ____ divides a distribution in half.

One should calculate a measure of magnitude of effect even when the null hypothesis cannot be rejected.

The standard deviation is the sum of the squared deviations from the mean,divided by the number of scores.

The Mann-Whitney test is a parametric test used to compare two independent samples of scores.

Rejecting the null hypothesis when it is actually false is:

Overview of Psychological Research

Explanation in Scientific Psychology

Exploring the Literature of Psychology

Conducting Ethical Research

Observations in Psychological Research

Relational Research

Basics of Experimentation

Validity and Reliability in Psychological Research

Experimental Design

Complex Design

Small-N Experimentation

Quasi-Experimentation

Interpreting the Results of Research

Presenting Research Results

Filters

The Greek letter sigma ( $\sigma$ )stands for the sample standard deviation.