Question 1

Imagine that you conducted an independent-groups t-test with 12 participants in each group.For a two-tailed test,the tcv at $\alpha$ = .05 would be

Accepted Answer

A) $\pm$1.717. 
B) $\pm$2.074. 
C) $\pm$1.711. 
D) $\pm$2.064. 
A) $\pm$1.717. 
B) $\pm$2.074. 
C) $\pm$1.711. 
D) $\pm$2.064.

Question 2

The alternative hypothesis for a two-tailed independent-groups t-test states that

Accepted Answer

A) H0: $\mu$1 $\neq$ $\mu$2. 
B) H0: $\mu$1 = $\mu$2. 
C) Ha: $\mu$1 $\neq$ $\mu$2. 
D) Ha: $\mu$1 = $\mu$2. 
A) H0: $\mu$1 $\neq$ $\mu$2. 
B) H0: $\mu$1 = $\mu$2. 
C) Ha: $\mu$1 $\neq$ $\mu$2. 
D) Ha: $\mu$1 = $\mu$2.

Question 3

As sample variance _____,the value of the t-test _____.

Accepted Answer

A) increases; increases 
B) decreases; decreases 
C) increases; decreases 
D) increases; stays the same 
A) increases; increases 
B) decreases; decreases 
C) increases; decreases 
D) increases; stays the same

Question 4

If the null hypothesis is true,then the t-test should be close to

Accepted Answer

A) 0.00. 
B) $\pm$1.65. 
C) $\pm$1.96. 
D) $\pm$3.00. 
A) 0.00. 
B) $\pm$1.65. 
C) $\pm$1.96. 
D) $\pm$3.00.

Question 5

For an independent-groups t-test,the value of Cohen's d describes

Accepted Answer

A) the size of the treatment effect. 
B) the chance of a Type I error. 
C) the chance of a Type II error. 
D) the overall chance level in the experiment. 
A) the size of the treatment effect. 
B) the chance of a Type I error. 
C) the chance of a Type II error. 
D) the overall chance level in the experiment.

Question 6

In a correlated-groups design,if n = 20,then df =

Accepted Answer

A) 20. 
B) 19. 
C) 21. 
D) 40. 
A) 20. 
B) 19. 
C) 21. 
D) 40.

Question 7

The Wilcoxon tests are used with _____ data.

Accepted Answer

A) ordinal 
B) interval 
C) ratio 
D) nominal 
A) ordinal 
B) interval 
C) ratio 
D) nominal

Question 8

In a research study comparing two conditions,researchers obtain 24 scores from each condition.If this was a within-subjects design,then there were _____ participants in the study.

Accepted Answer

A) 24 
B) 25 
C) 26 
D) 48 
A) 24 
B) 25 
C) 26 
D) 48

Question 9

When using a correlated-groups t-test,df =

Accepted Answer

A) n1 + n2 - 2. 
B) n - 1. 
C) n1 + n2 - 1. 
D) n - 2. 
A) n1 + n2 - 2. 
B) n - 1. 
C) n1 + n2 - 1. 
D) n - 2.

Question 10

Which of the following is not an assumption of the $\chi$2-test?

Accepted Answer

A) It is a nonparametric test. 
B) It is appropriate only for ordinal data. 
C) The frequency in each cell should be at least 5. 
D) The sample should be randomly selected. 
A) It is a nonparametric test. 
B) It is appropriate only for ordinal data. 
C) The frequency in each cell should be at least 5. 
D) The sample should be randomly selected.

Question 11

An independent-groups t-test

Accepted Answer

A) compares sample means for two related groups. 
B) compares sample means for two unrelated groups. 
C) compares standard deviations for two unrelated group. 
D) compares sample means for three or more unrelated groups. 
A) compares sample means for two related groups. 
B) compares sample means for two unrelated groups. 
C) compares standard deviations for two unrelated group. 
D) compares sample means for three or more unrelated groups.

Question 12

Imagine that you conducted a correlated-groups t-test with 12 participants.For a two-tailed test,the tcv at $\alpha$ = .05 would be

Accepted Answer

A) $\pm$1.796. 
B) $\pm$2.201. 
C) $\pm$1.782. 
D) $\pm$2.179. 
A) $\pm$1.796. 
B) $\pm$2.201. 
C) $\pm$1.782. 
D) $\pm$2.179.

Question 13

Which of the following is not an assumption of the t-test for independent groups?

Accepted Answer

A) The data are interval or ratio. 
B) The underlying distributions are bell-shaped. 
C) The observations are independent. 
D) There is not homogeneity of variance. 
A) The data are interval or ratio. 
B) The underlying distributions are bell-shaped. 
C) The observations are independent. 
D) There is not homogeneity of variance.

Question 14

Which of the following t-test results has the greatest chance of statistical significance?

Accepted Answer

A) t(28)= 1.70 
B) t(14)= 1.70 
C) t(18)= 1.70 
D) t(10)= 1.70 
A) t(28)= 1.70 
B) t(14)= 1.70 
C) t(18)= 1.70 
D) t(10)= 1.70

Question 15

The calculation of the df for the$\chi$2 test of independence is

Accepted Answer

A) r x c - 1. 
B) (r-1)(c-1). 
C) (r-c)n. 
D) r x c. 
A) r x c - 1. 
B) (r-1)(c-1). 
C) (r-c)n. 
D) r x c.

Question 16

Which of the following is true regarding the $\chi$2 test of independence?

Accepted Answer

A) It requires a numerical (quantitative)score for each individual. 
B) The sample must be random. 
C) Population parameters such as $\mu$ and $\sigma$must be known. 
D) The observations must not be independent. 
A) It requires a numerical (quantitative)score for each individual. 
B) The sample must be random. 
C) Population parameters such as $\mu$ and $\sigma$must be known. 
D) The observations must not be independent.

Question 17

The _____ is a nonparametric inferential test for comparing sample medians of two dependent or related groups of scores.

Accepted Answer

A) Wilcoxon matched-pairs signed-ranks T test 
B) Wilcoxon rank-sum test 
C) $\chi$2 test for independence 
D) $\chi$2 goodness-of-fit test 
A) Wilcoxon matched-pairs signed-ranks T test 
B) Wilcoxon rank-sum test 
C) $\chi$2 test for independence 
D) $\chi$2 goodness-of-fit test

Question 18

If an independent-groups t-test has 7 participants in each group,then the degrees of freedom are

Accepted Answer

A) 7. 
B) 14. 
C) 6. 
D) 12. 
A) 7. 
B) 14. 
C) 6. 
D) 12.

Question 19

If a researcher reported for an independent-groups t-test that t(18)= 2.90,p< .01,how many participants were there in the study?

Accepted Answer

A) 18 
B) 20 
C) 10 
D) 9 
A) 18 
B) 20 
C) 10 
D) 9

Imagine that you conducted an independent-groups t-test with 12 participants in each group.For a two-tailed test,the t_cv at $\alpha$ = .05 would be

The alternative hypothesis for a two-tailed independent-groups t-test states that

As sample variance _,the value of the t-test _.

If the null hypothesis is true,then the t-test should be close to

For an independent-groups t-test,the value of Cohen's d describes

In a correlated-groups design,if n = 20,then df =

The Wilcoxon tests are used with _____ data.

In a research study comparing two conditions,researchers obtain 24 scores from each condition.If this was a within-subjects design,then there were _____ participants in the study.

When using a correlated-groups t-test,df =

Which of the following is not an assumption of the $\chi$ ²-test?

An independent-groups t-test

Imagine that you conducted a correlated-groups t-test with 12 participants.For a two-tailed test,the t_cv at $\alpha$ = .05 would be

Which of the following is not an assumption of the t-test for independent groups?

Which of the following t-test results has the greatest chance of statistical significance?

The calculation of the df for the $\chi$ ² test of independence is

Which of the following is true regarding the $\chi$ ² test of independence?

The _____ is a nonparametric inferential test for comparing sample medians of two dependent or related groups of scores.

If an independent-groups t-test has 7 participants in each group,then the degrees of freedom are

If a researcher reported for an independent-groups t-test that t(18)= 2.90,p< .01,how many participants were there in the study?

Thinking Like a Scientist

Getting Started: Ideas, resources, and Ethics

Defining, measuring, and Manipulating Variables

Descriptive Methods

Data Organization and Descriptive Statistics

Correlational Methods and Statistics

Probability and Hypothesis Testing

Introduction to Inferential Statistics

The Logic of Experimental Design

Experimental Designs With More Than Two Levels of an Independent Variable

Complex Experimental Design

Quasi-Experimental and Single-Case Designs

Apa Communication Guidelines

Filters

Exam 10: Inferential Statistics: Two-Group Designs

Imagine that you conducted an independent-groups t-test with 12 participants in each group.For a two-tailed test,the tcv at α\alphaα = .05 would be

The alternative hypothesis for a two-tailed independent-groups t-test states that

As sample variance _____,the value of the t-test _____.

If the null hypothesis is true,then the t-test should be close to

For an independent-groups t-test,the value of Cohen's d describes

In a correlated-groups design,if n = 20,then df =

The Wilcoxon tests are used with _____ data.

In a research study comparing two conditions,researchers obtain 24 scores from each condition.If this was a within-subjects design,then there were _____ participants in the study.

When using a correlated-groups t-test,df =

Which of the following is not an assumption of the χ\chiχ 2-test?

An independent-groups t-test

Imagine that you conducted a correlated-groups t-test with 12 participants.For a two-tailed test,the tcv at α\alphaα = .05 would be

Which of the following is not an assumption of the t-test for independent groups?

Which of the following t-test results has the greatest chance of statistical significance?

The calculation of the df for the χ\chiχ 2 test of independence is

Which of the following is true regarding the χ\chiχ 2 test of independence?

The _____ is a nonparametric inferential test for comparing sample medians of two dependent or related groups of scores.

If an independent-groups t-test has 7 participants in each group,then the degrees of freedom are

If a researcher reported for an independent-groups t-test that t(18)= 2.90,p< .01,how many participants were there in the study?

Thinking Like a Scientist

Getting Started: Ideas, resources, and Ethics

Defining, measuring, and Manipulating Variables

Descriptive Methods

Data Organization and Descriptive Statistics

Correlational Methods and Statistics

Probability and Hypothesis Testing

Introduction to Inferential Statistics

The Logic of Experimental Design

Experimental Designs With More Than Two Levels of an Independent Variable

Complex Experimental Design

Quasi-Experimental and Single-Case Designs

Apa Communication Guidelines

Filters

Imagine that you conducted an independent-groups t-test with 12 participants in each group.For a two-tailed test,the t_cv at $\alpha$ = .05 would be

As sample variance _,the value of the t-test _.

Which of the following is not an assumption of the $\chi$ ²-test?

Imagine that you conducted a correlated-groups t-test with 12 participants.For a two-tailed test,the t_cv at $\alpha$ = .05 would be

The calculation of the df for the $\chi$ ² test of independence is

Which of the following is true regarding the $\chi$ ² test of independence?