Question 1

When reporting data in a results section,it is ______ necessary to identify the type of t test computed.

Accepted Answer

A)  always 
B)  not 
C)  usually 
D)  significantly 
A)  always 
B)  not 
C)  usually 
D)  significantly

Question 2

Selecting related samples can be more practical.

Accepted Answer

A) True 
 B)False

Question 3

The estimated Cohen's d for the related-samples t test uses the sample standard deviation for difference scores as an estimate of the standard deviation of difference scores in the population.

Accepted Answer

A) True 
 B)False

Question 4

The related-samples design can ______.

Accepted Answer

A)  eliminate within-groups error 
B)  have no effect on power 
C)  increase standard error 
D)  be more practical 
A)  eliminate within-groups error 
B)  have no effect on power 
C)  increase standard error 
D)  be more practical

Question 5

A researcher computes d = 0.26.Hence,it is appropriate to conclude that 26% of the variability in the dependent variable can be accounted for by the presence of the independent variable.

Accepted Answer

A) True 
 B)False

Question 6

The estimated standard error for difference scores is the denominator of the test statistic for a related-samples t test.

Accepted Answer

A) True 
 B)False

Question 7

The degrees of freedom for the related-samples t test are the number of pairs of participants minus one and not always the total number of participants minus one.

Accepted Answer

A) True 
 B)False

Question 8

Original pairs of scores are first reduced to difference scores before computing the test statistic for the related-samples t test.

Accepted Answer

A) True 
 B)False

Question 9

An example of matching by experimental manipulation would be if we matched participants based on their gender (male,female).

Accepted Answer

A) True 
 B)False

Question 10

The type of t test that was used is typically reported in a data analysis section that precedes the results section in an APA-style paper.

Accepted Answer

A) True 
 B)False

Question 11

A researcher sampled 25 participants and measured their alcohol consumption (in ounces)in both a home and a bar setting.If the mean difference in satisfaction ratings for this sample was 11.4 ± 2.5 (MD ± SMD),then what is the decision at a .05 level of significance?

Accepted Answer

A)  Alcohol consumption significantly differed, t(23) = 4.56. 
B)  Alcohol consumption significantly differed, t(24) = 4.56. 
C)  Alcohol consumption significantly differed, t(23) = 22.80. 
D)  Alcohol consumption significantly differed, t(24) = 22.80. 
A)  Alcohol consumption significantly differed, t(23) = 4.56. 
B)  Alcohol consumption significantly differed, t(24) = 4.56. 
C)  Alcohol consumption significantly differed, t(23) = 22.80. 
D)  Alcohol consumption significantly differed, t(24) = 22.80.

Question 12

Selecting related samples minimizes standard error and increases power.

Accepted Answer

A) True 
 B)False

Question 13

Each of the following is needed to compute the estimated Cohen's d,except

Accepted Answer

A)  the mean difference. 
B)  the standard error. 
C)  the standard deviation of difference scores. 
A)  the mean difference. 
B)  the standard error. 
C)  the standard deviation of difference scores.

Question 14

A researcher selects a sample of 36 dog owners and measures their responsiveness to pictures depicting the humane and inhumane treatment of dogs.The researcher finds that responsiveness significantly differed,t = 3.243.Use  $\eta$2 to compute the proportion of variance for this result.

Accepted Answer

A)   $\eta$2 = .21 
B)   $\eta$2 = .23 
C)   $\eta$2 = .25 
D)  there is not enough information to answer this question 
A)   $\eta$2 = .21 
B)   $\eta$2 = .23 
C)   $\eta$2 = .25 
D)  there is not enough information to answer this question

Question 15

A researcher computes a related-samples t test with t(20)= 2.096.In this example,the decision is to reject the null hypothesis for a one-tailed test,but not for a two-tailed test.

Accepted Answer

A) True 
 B)False

Question 16

A researcher placed male rodents in the presence and absence of a conspecific male.Cortisol (a stress hormone)levels were compared at both times.What type of t test is most appropriate for this study?

Accepted Answer

A)  one-sample t test 
B)  two-independent-sample t test 
C)  related-samples t test 
D)  There is not enough information to answer this question. 
A)  one-sample t test 
B)  two-independent-sample t test 
C)  related-samples t test 
D)  There is not enough information to answer this question.

Question 17

What are the degrees of freedom for the related-samples t test?

Accepted Answer

A)  (nD - 1) 
B)  (n - 1) (n - 1) 
C)  (n - 1) + (n - 1) 
D)  (n - 1) - (n - 1) 
A)  (nD - 1) 
B)  (n - 1) (n - 1) 
C)  (n - 1) + (n - 1) 
D)  (n - 1) - (n - 1)

Question 18

A study in which 26 participants are observed two times is associated with 26 degrees of freedom for a related-samples t test.

Accepted Answer

A) True 
 B)False

Question 19

Each of the following is an estimate of error for a t test,except

Accepted Answer

A)  standard error. 
B)  estimated standard error. 
C)  estimated standard error for the difference. 
D)  estimated standard error for difference scores. 
A)  standard error. 
B)  estimated standard error. 
C)  estimated standard error for the difference. 
D)  estimated standard error for difference scores.

Question 20

To increase the value of estimated Cohen's d,a researcher increases the sample size.Will this change the value of d?

Accepted Answer

A)  Yes; as sample size increases, effect size increases. 
B)  No; as sample size increases, effect size decreases. 
C)  No; the sample size is not used to compute effect size. 
D)  Yes; as sample size increases, effect size decreases. 
A)  Yes; as sample size increases, effect size increases. 
B)  No; as sample size increases, effect size decreases. 
C)  No; the sample size is not used to compute effect size. 
D)  Yes; as sample size increases, effect size decreases.

When reporting data in a results section,it is ______ necessary to identify the type of t test computed.

Selecting related samples can be more practical.

The estimated Cohen's d for the related-samples t test uses the sample standard deviation for difference scores as an estimate of the standard deviation of difference scores in the population.

The related-samples design can ______.

A researcher computes d = 0.26.Hence,it is appropriate to conclude that 26% of the variability in the dependent variable can be accounted for by the presence of the independent variable.

The estimated standard error for difference scores is the denominator of the test statistic for a related-samples t test.

The degrees of freedom for the related-samples t test are the number of pairs of participants minus one and not always the total number of participants minus one.

Original pairs of scores are first reduced to difference scores before computing the test statistic for the related-samples t test.

An example of matching by experimental manipulation would be if we matched participants based on their gender (male,female).

The type of t test that was used is typically reported in a data analysis section that precedes the results section in an APA-style paper.

A researcher sampled 25 participants and measured their alcohol consumption (in ounces)in both a home and a bar setting.If the mean difference in satisfaction ratings for this sample was 11.4 ± 2.5 (M_D ± S_MD),then what is the decision at a .05 level of significance?

Selecting related samples minimizes standard error and increases power.

Each of the following is needed to compute the estimated Cohen's d,except

A researcher selects a sample of 36 dog owners and measures their responsiveness to pictures depicting the humane and inhumane treatment of dogs.The researcher finds that responsiveness significantly differed,t = 3.243.Use $\eta$ ² to compute the proportion of variance for this result.

A researcher computes a related-samples t test with t(20)= 2.096.In this example,the decision is to reject the null hypothesis for a one-tailed test,but not for a two-tailed test.

A researcher placed male rodents in the presence and absence of a conspecific male.Cortisol (a stress hormone)levels were compared at both times.What type of t test is most appropriate for this study?

What are the degrees of freedom for the related-samples t test?

A study in which 26 participants are observed two times is associated with 26 degrees of freedom for a related-samples t test.

Each of the following is an estimate of error for a t test,except

To increase the value of estimated Cohen's d,a researcher increases the sample size.Will this change the value of d?

Introduction to Statistics

Summarizing Data: Frequency Distributions in Tables and Graphs

Summarizing Data: Central Tendency

Summarizing Data: Variability

Probability

Probability, normal Distributions, and Z Scores

Probability and Sampling Distributions

Hypothesis Testing: Significance,effect Size,and Power

Testing Means: One-Sample and Two-Independent-Sample T Tests

Estimation and Confidence Intervals

Analysis of Variance: One-Way Between-Subjects Design

Analysis of Variance: One-Way Within-Subjects Repeated-Measuresdesign

Analysis of Variance: Two-Way Between-Subjects Factorial Design

Correlation

Linear Regression and Multiple Regression

Nonparametric Tests: Chi-Square Tests

Nonparametric Tests: Tests for Ordinal Data

Filters

Exam 10: Testing Means: Truehe Related-Samples T Test

When reporting data in a results section,it is ______ necessary to identify the type of t test computed.

Selecting related samples can be more practical.

The estimated Cohen's d for the related-samples t test uses the sample standard deviation for difference scores as an estimate of the standard deviation of difference scores in the population.

The related-samples design can ______.

A researcher computes d = 0.26.Hence,it is appropriate to conclude that 26% of the variability in the dependent variable can be accounted for by the presence of the independent variable.

The estimated standard error for difference scores is the denominator of the test statistic for a related-samples t test.

The degrees of freedom for the related-samples t test are the number of pairs of participants minus one and not always the total number of participants minus one.

Original pairs of scores are first reduced to difference scores before computing the test statistic for the related-samples t test.

An example of matching by experimental manipulation would be if we matched participants based on their gender (male,female).

The type of t test that was used is typically reported in a data analysis section that precedes the results section in an APA-style paper.

A researcher sampled 25 participants and measured their alcohol consumption (in ounces)in both a home and a bar setting.If the mean difference in satisfaction ratings for this sample was 11.4 ± 2.5 (MD ± SMD),then what is the decision at a .05 level of significance?

Selecting related samples minimizes standard error and increases power.

Each of the following is needed to compute the estimated Cohen's d,except

A researcher selects a sample of 36 dog owners and measures their responsiveness to pictures depicting the humane and inhumane treatment of dogs.The researcher finds that responsiveness significantly differed,t = 3.243.Use η\etaη 2 to compute the proportion of variance for this result.

A researcher computes a related-samples t test with t(20)= 2.096.In this example,the decision is to reject the null hypothesis for a one-tailed test,but not for a two-tailed test.

A researcher placed male rodents in the presence and absence of a conspecific male.Cortisol (a stress hormone)levels were compared at both times.What type of t test is most appropriate for this study?

What are the degrees of freedom for the related-samples t test?

A study in which 26 participants are observed two times is associated with 26 degrees of freedom for a related-samples t test.

Each of the following is an estimate of error for a t test,except

To increase the value of estimated Cohen's d,a researcher increases the sample size.Will this change the value of d?

Introduction to Statistics

Summarizing Data: Frequency Distributions in Tables and Graphs

Summarizing Data: Central Tendency

Summarizing Data: Variability

Probability

Probability, normal Distributions, and Z Scores

Probability and Sampling Distributions

Hypothesis Testing: Significance,effect Size,and Power

Testing Means: One-Sample and Two-Independent-Sample T Tests

Estimation and Confidence Intervals

Analysis of Variance: One-Way Between-Subjects Design

Analysis of Variance: One-Way Within-Subjects Repeated-Measuresdesign

Analysis of Variance: Two-Way Between-Subjects Factorial Design

Correlation

Linear Regression and Multiple Regression

Nonparametric Tests: Chi-Square Tests

Nonparametric Tests: Tests for Ordinal Data

Filters

A researcher sampled 25 participants and measured their alcohol consumption (in ounces)in both a home and a bar setting.If the mean difference in satisfaction ratings for this sample was 11.4 ± 2.5 (M_D ± S_MD),then what is the decision at a .05 level of significance?

A researcher selects a sample of 36 dog owners and measures their responsiveness to pictures depicting the humane and inhumane treatment of dogs.The researcher finds that responsiveness significantly differed,t = 3.243.Use $\eta$ ² to compute the proportion of variance for this result.