Question 1

Typical data used with the t-test are those from survey and secondary datasets.

Accepted Answer

A) True 
 B)False  True

Question 2

There are two forms of variation that a t-test can measure.The type of variation used to test your hypothesis is called

Accepted Answer

A) unequal variance 
B) equal variance 
C) within-group variance 
D) none of the above 
A) unequal variance 
B) equal variance 
C) within-group variance 
D) none of the above D

Question 3

If a variable is measured in an experiment at time 1 (pretest)and again at time 2 (posttest),the most appropriate t-test would be

Accepted Answer

A) independent samples t-test 
B) equal variances t-test 
C) related samples t-test 
D) none of the above,you cannot use a t-test with this data 
A) independent samples t-test 
B) equal variances t-test 
C) related samples t-test 
D) none of the above,you cannot use a t-test with this data C

Question 4

The t-test is a

Accepted Answer

A) nonparametric statistic 
B) parameteric statistic 
C) predictive statistic 
D) descriptive statistic 
A) nonparametric statistic 
B) parameteric statistic 
C) predictive statistic 
D) descriptive statistic

Question 5

A t-test can compare as many as four groups at a time without losing power.

Accepted Answer

A) True 
 B)False

Question 6

If the probability associated with a t-test is larger than your alpha level,what do you do?

Accepted Answer

A) accept your hypothesis and reject the null hypothesis 
B) reject your hypothesis and accept the null hypothesis 
C) reject both your hypothesis and the null hypothesis 
D) use the version of the F-test associated with larger probabilities. 
A) accept your hypothesis and reject the null hypothesis 
B) reject your hypothesis and accept the null hypothesis 
C) reject both your hypothesis and the null hypothesis 
D) use the version of the F-test associated with larger probabilities.

Question 7

If the F-ratio test (Levene's test)produces a significant result,which of the choices below would be correct?

Accepted Answer

A) you use the unequal variance t-test 
B) you use the equal variance t-test 
C) you skip the t-test because the direction is not correct 
D) you must complete the t-test because the direction is correct 
A) you use the unequal variance t-test 
B) you use the equal variance t-test 
C) you skip the t-test because the direction is not correct 
D) you must complete the t-test because the direction is correct

Question 8

Because of its stringent assumptions,the t-test is not very commonly used in criminal justice or criminological research.

Accepted Answer

A) True 
 B)False

Question 9

When used with small samples,the t-test produces a conservative estimate of differences.

Accepted Answer

A) True 
 B)False

Question 10

The t-test is properly used with which level of measurement below?

Accepted Answer

A) nominal level 
B) ordinal level 
C) interval level 
D) it can be used with all levels 
A) nominal level 
B) ordinal level 
C) interval level 
D) it can be used with all levels

Question 11

Assuming all assumptions are met,which version below is the most powerful (accurate)t-test?

Accepted Answer

A) k-samples t-test 
B) unequal variance t-test 
C) equal variance t-test 
D) independent samples t-test 
A) k-samples t-test 
B) unequal variance t-test 
C) equal variance t-test 
D) independent samples t-test

Question 12

If you have two groups with equal variances,which of the t-tests below would you use?

Accepted Answer

A) unequal variance t-test 
B) equal variance t-test 
C) equal means t-test 
D) unequal means t-test 
A) unequal variance t-test 
B) equal variance t-test 
C) equal means t-test 
D) unequal means t-test

Question 13

If you propose a one-tailed hypothesis,you must examine the group means before proceeding.

Accepted Answer

A) True 
 B)False

Question 14

Which of these assumptions below apply to the t-test?

Accepted Answer

A) the marginals are equal and normally distributed 
B) the dependent variable is normally distributed and there are two groups 
C) large sample sizes and equal marginals 
D) large sample sizes and normally-distributed independent variables 
A) the marginals are equal and normally distributed 
B) the dependent variable is normally distributed and there are two groups 
C) large sample sizes and equal marginals 
D) large sample sizes and normally-distributed independent variables

Question 15

The best alternative to a independent-samples t-test if assumptions are violated is the Mann-Whitney U-test.

Accepted Answer

A) True 
 B)False

Question 16

A two-tailed hypothesis is the most appropriate for a t-test because of the difficulty of determining direction in the variances.

Accepted Answer

A) True 
 B)False

Question 17

The t-test is designed to examine the number of cases in two groups to determine which one is the group with the most cases.

Accepted Answer

A) True 
 B)False

Question 18

The Levene's test is used for which purpose below?

Accepted Answer

A) to determine whether a t-test result is significant 
B) to test the F-ratio hypothesis that two means are equal 
C) to determine whether the data are related or independent 
D) to determine which t-test to use 
A) to determine whether a t-test result is significant 
B) to test the F-ratio hypothesis that two means are equal 
C) to determine whether the data are related or independent 
D) to determine which t-test to use

Question 19

The t-test has some stringent assumptions,if the data reasonably depart from those assumptions

Accepted Answer

A) the t-test results can probably still be used 
B) the t-test can no longer be used 
C) it is best to use the Levene's Test instead of the t-test 
D) you should use both the t-test and the Levene's Test to determine how much assumptions have been violated 
A) the t-test results can probably still be used 
B) the t-test can no longer be used 
C) it is best to use the Levene's Test instead of the t-test 
D) you should use both the t-test and the Levene's Test to determine how much assumptions have been violated

Question 20

The t-distribution for smaller sample sizes is slightly different from a normal distribution because:

Accepted Answer

A) it has more data in the middle of the curve 
B) it is shaped more like a rectangle 
C) it is a positively skewed distribution 
D) it has more data in the tails of the curve 
A) it has more data in the middle of the curve 
B) it is shaped more like a rectangle 
C) it is a positively skewed distribution 
D) it has more data in the tails of the curve

Exam 12: Testing for Significance in Two Groups: the T-Test

Typical data used with the t-test are those from survey and secondary datasets.

There are two forms of variation that a t-test can measure.The type of variation used to test your hypothesis is called

If a variable is measured in an experiment at time 1 (pretest)and again at time 2 (posttest),the most appropriate t-test would be

The t-test is a

A t-test can compare as many as four groups at a time without losing power.

If the probability associated with a t-test is larger than your alpha level,what do you do?

If the F-ratio test (Levene's test)produces a significant result,which of the choices below would be correct?

Because of its stringent assumptions,the t-test is not very commonly used in criminal justice or criminological research.

When used with small samples,the t-test produces a conservative estimate of differences.

The t-test is properly used with which level of measurement below?

Assuming all assumptions are met,which version below is the most powerful (accurate)t-test?

If you have two groups with equal variances,which of the t-tests below would you use?

If you propose a one-tailed hypothesis,you must examine the group means before proceeding.

Which of these assumptions below apply to the t-test?

The best alternative to a independent-samples t-test if assumptions are violated is the Mann-Whitney U-test.

A two-tailed hypothesis is the most appropriate for a t-test because of the difficulty of determining direction in the variances.

The t-test is designed to examine the number of cases in two groups to determine which one is the group with the most cases.

The Levene's test is used for which purpose below?

The t-test has some stringent assumptions,if the data reasonably depart from those assumptions

The t-distribution for smaller sample sizes is slightly different from a normal distribution because:

Introduction to Statistics

Levels of Measurement

Graphical Statistics

Measures of Central Tendency

Measures of Dispersion

Curves and Distributions

Frequency Distributions

Elementary Relationships: Crosstabulation Tables

Hypotheses and Sampling Distributions

Statistical Significance

Testing for Significance: the Chi-Square Test

Testing for Significance in Multiple Groups: the Analysis of Variance Statistic

The Concept of Association

Testing for Association: Phi

Testing for Association: Pearsons R and Regression

Doing Real Research: Elementary Multivariate Relationships

Box Plots

Skewness and Kurtosis

Ordinal-Level Tests of Significance

Multiple Comparison Tests

Nominal Level Tests of Association

Ordinal Level Tests of Association

Addendum Probability

Filters