Question 1

For a repeated-measures study comparing two treatment conditions,a researcher obtains Cohen's d = 0.50 for a sample of n = 4 scores with a variance of s2 = 16.What is the value of the sample mean?​

Accepted Answer

A) MD = 2​ 
B) ​MD = 4 
C) ​MD = 8 
D) ​MD = 16

Question 2

A researcher obtains t(20)= 2.00 and MD = 9 for a repeated-measures study.If the researcher measures effect size using the percentage of variance accounted for,what value will be obtained for r2?​

Accepted Answer

A) ​9/20 
B) ​9/29 
C) ​4/13 
D) ​4/24

Question 3

Calculate the difference scores and find M_D for the following data from a repeated-measures study.Subject Treatment 1 Treatment 2 $$\begin{array} { r r r } \mathrm { A } & 12 & 14 \ \mathrm {~B} & 7 & 15 \ \mathrm { C } & 10 & 8 \ \mathrm { D } & 8 & 12 \end{array}$$

Accepted Answer

The answer of Calculate the difference scores and find M_D...

Question 4

If all of the participants in a repeated-measures study show roughly the same 10-point difference between treatments,then the data are likely to produce a significant value for the t statistic.

Accepted Answer

A) True 
 B)False

Question 5

Repeated-measures designs are particularly well-suited to research questions concerning the difference between two distinct populations (for example,males versus females).​

Accepted Answer

A) True 
 B)False

Question 6

Which possible outcome is of serious concern with a repeated-measures study?​

Accepted Answer

A) ​You will obtain negative values for the difference scores. 
B) ​The results will be influenced by order effects. 
C) ​The mean difference is due to individual differences rather than treatment differences. 
D) ​You lose too many degrees of freedom.

Question 7

In general,what characteristics of the difference scores are most likely to produce a significant t statistic for the repeated-measures hypothesis test?​

Accepted Answer

A) ​a large number of scores and a large variance 
B) ​a large number of scores and a small variance 
C) ​a small number of scores and a large variance 
D) ​a small number of scores and a small variance

Question 8

A researcher is using a repeated-measures study to evaluate the difference between two treatments.If the difference between the treatments is consistent from one participant to another,then the data should produce a ____.​

Accepted Answer

A) ​small variance for the difference scores and a small standard error 
B) ​small variance for the difference scores and a large standard error 
C) ​large variance for the difference scores and a small standard error 
D) ​large variance for the difference scores and a large standard error

Question 9

A matched-subjects study and an independent-measures study both produced a t statistic with df = 16.How many individuals participated in each study?​

Accepted Answer

A) ​17 for matched-subjects and 17 for independent-measures 
B) ​17 for matched-subjects and 18 for independent-measures 
C) ​18 for matched-subjects and 18 for independent-measures 
D) ​34 for matched-subjects and 18 for independent-measures

Question 10

For a repeated-measures study comparing two treatment conditions,a researcher obtains a sample of n = 9 difference scores with a mean of MD = 4 and a variance of s2 = 36.What is the value for the repeated-measures t statistic for these data?​

Accepted Answer

A) ​4/2 
B) ​4/4 
C) ​4/6 
D) ​4/36

Question 11

A repeated-measures study using a sample of n = 20 participants would produce a t statistic with df = ____.​

Accepted Answer

A) 9​ 
B) ​19 
C) ​20 
D) ​39

Question 12

A researcher reports t(12)= 2.86,p < .05 for a repeated-measures research study.How many individuals participated in the study?​

Accepted Answer

A) n = 11​ 
B) ​n = 13 
C) ​n = 24 
D) ​n = 25

Question 13

A researcher uses a repeated-measures design to compare individuals' performance before treatment with their performance after treatment.If all of the participants show improved performance of 8 or 9 points after treatment,then the researcher should find ____.​

Accepted Answer

A) ​a sample mean difference near zero 
B) ​a t statistic near zero 
C) ​the variance of the difference scores is near zero 
D) ​a very large variance in the difference scores

Question 14

A researcher conducts a repeated-measures study to evaluate a treatment with a sample of n = 16 participants and obtains a t statistic of t = 1.94.The treatment is expected to increase scores and the sample mean shows an increase.What is the correct decision for a hypothesis test using α = .05?​

Accepted Answer

A) ​Reject the null hypothesis with a one-tailed test but fail to reject with two tails. 
B) ​Reject the null hypothesis with either a one-tailed or a two-tailed test. 
C) ​Fail to reject the null hypothesis with either a one-tailed or a two-tailed test. 
D) ​Fail to reject the null hypothesis with a one-tailed test but reject with two tails.

Question 15

A Wilcoxon test can be used if there is reason to suspect that one of the assumptions for the repeated-measures t test has been violated.

Accepted Answer

A) True 
 B)False

Question 16

Assuming that other factors are held constant,which approach would tend to increase the likelihood of rejecting the null hypothesis?​

Accepted Answer

A) ​Decrease the sample size. 
B) ​Increase the sample mean difference. 
C) ​Increase the sample variance. 
D) ​Decrease the sample mean difference.

Question 17

A set of n = 16 difference scores has a mean of MD = 4 and a variance of s2 = 36.Cohen's d for this sample is d = 4/6.

Accepted Answer

A) True 
 B)False

Question 18

Repeated-measures designs are particularly well-suited to research studies examining learning or other changes that occur over time.

Accepted Answer

A) True 
 B)False

Question 19

A research report describing the results from a repeated-measures study states: The data show no significant difference between the two treatments,t(10)= 1.65,p > .05.Based on this report,you can conclude that a total of ____ individuals participated in the research study.​

Accepted Answer

A) ​9 
B) ​10 
C) ​11 
D) ​12

Question 20

In the repeated-measures t statistic,the value for the estimated standard error in the denominator is computed entirely from the sample data.

Accepted Answer

A) True 
 B)False

Exam 11: The T Test for Two Related Samples

For a repeated-measures study comparing two treatment conditions,a researcher obtains Cohen's d = 0.50 for a sample of n = 4 scores with a variance of s² = 16.What is the value of the sample mean?

A researcher obtains t(20) = 2.00 and M_D = 9 for a repeated-measures study.If the researcher measures effect size using the percentage of variance accounted for,what value will be obtained for r²?

Calculate the difference scores and find M_D for the following data from a repeated-measures study.Subject Treatment 1 Treatment 2 $\begin{array} { r r r } \mathrm { A } & 12 & 14 \\\mathrm {~B} & 7 & 15 \\\mathrm { C } & 10 & 8 \\\mathrm { D } & 8 & 12\end{array}$

If all of the participants in a repeated-measures study show roughly the same 10-point difference between treatments,then the data are likely to produce a significant value for the t statistic.

Repeated-measures designs are particularly well-suited to research questions concerning the difference between two distinct populations (for example,males versus females).

Which possible outcome is of serious concern with a repeated-measures study?

In general,what characteristics of the difference scores are most likely to produce a significant t statistic for the repeated-measures hypothesis test?

A researcher is using a repeated-measures study to evaluate the difference between two treatments.If the difference between the treatments is consistent from one participant to another,then the data should produce a ____.

A matched-subjects study and an independent-measures study both produced a t statistic with df = 16.How many individuals participated in each study?

For a repeated-measures study comparing two treatment conditions,a researcher obtains a sample of n = 9 difference scores with a mean of M_D = 4 and a variance of s² = 36.What is the value for the repeated-measures t statistic for these data?

A repeated-measures study using a sample of n = 20 participants would produce a t statistic with df = ____.

A researcher reports t(12) = 2.86,p < .05 for a repeated-measures research study.How many individuals participated in the study?

A researcher uses a repeated-measures design to compare individuals' performance before treatment with their performance after treatment.If all of the participants show improved performance of 8 or 9 points after treatment,then the researcher should find ____.

A researcher conducts a repeated-measures study to evaluate a treatment with a sample of n = 16 participants and obtains a t statistic of t = 1.94.The treatment is expected to increase scores and the sample mean shows an increase.What is the correct decision for a hypothesis test using α = .05?

A Wilcoxon test can be used if there is reason to suspect that one of the assumptions for the repeated-measures t test has been violated.

Assuming that other factors are held constant,which approach would tend to increase the likelihood of rejecting the null hypothesis?

A set of n = 16 difference scores has a mean of M_D = 4 and a variance of s² = 36.Cohen's d for this sample is d = 4/6.

Repeated-measures designs are particularly well-suited to research studies examining learning or other changes that occur over time.

A research report describing the results from a repeated-measures study states: The data show no significant difference between the two treatments,t(10) = 1.65,p > .05.Based on this report,you can conclude that a total of ____ individuals participated in the research study.

In the repeated-measures t statistic,the value for the estimated standard error in the denominator is computed entirely from the sample data.

Exam 11: The T Test for Two Related Samples

For a repeated-measures study comparing two treatment conditions,a researcher obtains Cohen's d = 0.50 for a sample of n = 4 scores with a variance of s2 = 16.What is the value of the sample mean?​

A researcher obtains t(20) = 2.00 and MD = 9 for a repeated-measures study.If the researcher measures effect size using the percentage of variance accounted for,what value will be obtained for r2?​

If all of the participants in a repeated-measures study show roughly the same 10-point difference between treatments,then the data are likely to produce a significant value for the t statistic.

Repeated-measures designs are particularly well-suited to research questions concerning the difference between two distinct populations (for example,males versus females).​

Which possible outcome is of serious concern with a repeated-measures study?​

In general,what characteristics of the difference scores are most likely to produce a significant t statistic for the repeated-measures hypothesis test?​

A researcher is using a repeated-measures study to evaluate the difference between two treatments.If the difference between the treatments is consistent from one participant to another,then the data should produce a ____.​

A matched-subjects study and an independent-measures study both produced a t statistic with df = 16.How many individuals participated in each study?​

For a repeated-measures study comparing two treatment conditions,a researcher obtains a sample of n = 9 difference scores with a mean of MD = 4 and a variance of s2 = 36.What is the value for the repeated-measures t statistic for these data?​

A repeated-measures study using a sample of n = 20 participants would produce a t statistic with df = ____.​

A researcher reports t(12) = 2.86,p < .05 for a repeated-measures research study.How many individuals participated in the study?​

A researcher uses a repeated-measures design to compare individuals' performance before treatment with their performance after treatment.If all of the participants show improved performance of 8 or 9 points after treatment,then the researcher should find ____.​

A researcher conducts a repeated-measures study to evaluate a treatment with a sample of n = 16 participants and obtains a t statistic of t = 1.94.The treatment is expected to increase scores and the sample mean shows an increase.What is the correct decision for a hypothesis test using α = .05?​

A Wilcoxon test can be used if there is reason to suspect that one of the assumptions for the repeated-measures t test has been violated.

Assuming that other factors are held constant,which approach would tend to increase the likelihood of rejecting the null hypothesis?​

A set of n = 16 difference scores has a mean of MD = 4 and a variance of s2 = 36.Cohen's d for this sample is d = 4/6.

Repeated-measures designs are particularly well-suited to research studies examining learning or other changes that occur over time.

A research report describing the results from a repeated-measures study states: The data show no significant difference between the two treatments,t(10) = 1.65,p > .05.Based on this report,you can conclude that a total of ____ individuals participated in the research study.​

In the repeated-measures t statistic,the value for the estimated standard error in the denominator is computed entirely from the sample data.

For a repeated-measures study comparing two treatment conditions,a researcher obtains Cohen's d = 0.50 for a sample of n = 4 scores with a variance of s² = 16.What is the value of the sample mean?

A researcher obtains t(20) = 2.00 and M_D = 9 for a repeated-measures study.If the researcher measures effect size using the percentage of variance accounted for,what value will be obtained for r²?

Repeated-measures designs are particularly well-suited to research questions concerning the difference between two distinct populations (for example,males versus females).

Which possible outcome is of serious concern with a repeated-measures study?

In general,what characteristics of the difference scores are most likely to produce a significant t statistic for the repeated-measures hypothesis test?

A researcher is using a repeated-measures study to evaluate the difference between two treatments.If the difference between the treatments is consistent from one participant to another,then the data should produce a ____.

A matched-subjects study and an independent-measures study both produced a t statistic with df = 16.How many individuals participated in each study?

For a repeated-measures study comparing two treatment conditions,a researcher obtains a sample of n = 9 difference scores with a mean of M_D = 4 and a variance of s² = 36.What is the value for the repeated-measures t statistic for these data?

A repeated-measures study using a sample of n = 20 participants would produce a t statistic with df = ____.

A researcher reports t(12) = 2.86,p < .05 for a repeated-measures research study.How many individuals participated in the study?

A researcher uses a repeated-measures design to compare individuals' performance before treatment with their performance after treatment.If all of the participants show improved performance of 8 or 9 points after treatment,then the researcher should find ____.

A researcher conducts a repeated-measures study to evaluate a treatment with a sample of n = 16 participants and obtains a t statistic of t = 1.94.The treatment is expected to increase scores and the sample mean shows an increase.What is the correct decision for a hypothesis test using α = .05?

Assuming that other factors are held constant,which approach would tend to increase the likelihood of rejecting the null hypothesis?

A set of n = 16 difference scores has a mean of M_D = 4 and a variance of s² = 36.Cohen's d for this sample is d = 4/6.

A research report describing the results from a repeated-measures study states: The data show no significant difference between the two treatments,t(10) = 1.65,p > .05.Based on this report,you can conclude that a total of ____ individuals participated in the research study.