Question 1

Individual differences are characteristics such as age,IQ,gender,and personality that vary from one individual to another.

Accepted Answer

A) True 
 B)False

Question 2

A researcher reports df = 18 for a repeated-measures t statistic.This research study used a total of n = 19 participants.

Accepted Answer

A) True 
 B)False

Question 3

For which of the following situations would a repeated-measures research design be appropriate?​

Accepted Answer

A) ​comparing mathematical skills for girls versus boys at age 10 
B) ​comparing pain tolerance with and without acupuncture needles 
C) ​comparing self-esteem for students who participate in school athletics versus those who do not 
D) ​comparing verbal solving skills for science majors versus art majors at a college 
A) ​comparing mathematical skills for girls versus boys at age 10 
B) ​comparing pain tolerance with and without acupuncture needles 
C) ​comparing self-esteem for students who participate in school athletics versus those who do not 
D) ​comparing verbal solving skills for science majors versus art majors at a college

Question 4

A researcher plans to conduct a research study comparing two treatment conditions with a total of 20 scores in each treatment.Which of the following designs would require only 20 participants?​

Accepted Answer

A) ​independent-measures design 
B) ​repeated-measures design 
C) ​matched-subjects design 
D) ​between-measures design 
A) ​independent-measures design 
B) ​repeated-measures design 
C) ​matched-subjects design 
D) ​between-measures design

Question 5

For a repeated-measures design,df = n1 + n2 - 2 for the t statistic.

Accepted Answer

A) True 
 B)False

Question 6

A repeated-measures study with a sample of n = 16 participants produces a repeated-measures t = 2.00.If effect size is measured using r2,then r2 = 4/20.

Accepted Answer

A) True 
 B)False

Question 7

A teacher gives a third grade class of n = 16 a reading skills test at the beginning of the school year.To evaluate the changes that occur during the year,students are tested again at the end of the year.Their test scores revealed an average improvement of MD = 4.7 points.
a. If the variance for the difference scores is s2 = 144, are the results sufficient to conclude that there is significant improvement? Use a one-tailed test with α = .05.
b. If the variance for the difference scores is reduced to s2 = 64, are the results sufficient to conclude that there is significant improvement? Use a one-tailed test with α = .05.
c. Describe the effect on reducing the variance of the difference scores.

Accepted Answer

a.With s2 = 144,the estimated standard e

Question 8

A repeated-measures research study uses a total of 20 participants to compare two treatment conditions.If the results are used to construct a 90% confidence interval for the population mean difference,then the t values will be ±1.729.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following is the correct null hypothesis for a repeated-measures t test?​

Accepted Answer

A) ​MD = 0 
B) ​µD = 0 
C) ​µ1 = µ2 
D) ​M1 = M2 
A) ​MD = 0 
B) ​µD = 0 
C) ​µ1 = µ2 
D) ​M1 = M2

Question 10

In a repeated-measures design,or a within-subjects design,one group of participants is measured in two different treatment conditions so there are two separate scores for each individual in the sample.

Accepted Answer

A) True 
 B)False

Question 11

A researcher would like to examine how the chemical tryptophan,contained in foods such as turkey,can affect mental alertness.A sample of n = 9 college students is obtained and each student's performance on a familiar video game is measured before and after eating a traditional Thanksgiving dinner including roast turkey.The average score dropped by M = 14 points after the meal with SS = 1152 for the difference scores.
a. Is there is significant difference in performance before eating versus after eating? Use a two-tailed test with α = .05.
b. Compute r2 to measure the size of the effect.
c. Write a sentence demonstrating how the outcome of the test and the measure of effect size would appear in a research report.

Accepted Answer

a.The estimated standard error for these

Question 12

For the repeated-measures t statistic,where n1 and n2 are the number of scores before and after treatment,and n = n1= n2,df = ____.​

Accepted Answer

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

Question 13

If the sample size is held constant,which of the following will produce the widest 90% confidence interval for the population mean difference for a repeated-measures study?​

Accepted Answer

A) ​MD = 5 with s2 = 5 for the difference scores 
B) ​MD = 5 with s2 = 10 for the difference scores 
C) ​MD = 3 with s2 = 10 for the difference scores 
D) ​MD = 3 with s2 = 20 for the difference scores 
A) ​MD = 5 with s2 = 5 for the difference scores 
B) ​MD = 5 with s2 = 10 for the difference scores 
C) ​MD = 3 with s2 = 10 for the difference scores 
D) ​MD = 3 with s2 = 20 for the difference scores

Question 14

In general,what is the effect of an increase in the variance for the sample of difference scores?​

Accepted Answer

A) ​an increase in the standard error and an increase in the value of t 
B) ​an increase in the standard error and a decrease in the value of t 
C) ​a decrease in the standard error and an increase in the value of t 
D) ​a decrease in the standard error and a decrease in the value of t 
A) ​an increase in the standard error and an increase in the value of t 
B) ​an increase in the standard error and a decrease in the value of t 
C) ​a decrease in the standard error and an increase in the value of t 
D) ​a decrease in the standard error and a decrease in the value of t

Question 15

For a repeated-measures study comparing two treatments with a sample of n = 9 participants,the difference scores have a mean of MD = 4.90 with SS = 288.What is the estimated standard error for the sample mean difference?​

Accepted Answer

A) ​36 
B) ​36/8 = 4.5 
C) ​4 
D) ​2 
A) ​36 
B) ​36/8 = 4.5 
C) ​4 
D) ​2

Question 16

A repeated-measures study comparing two treatments with a sample of n = 4 participants produces a mean of M = 18 with SS = 24 for the scores in the first treatment,a mean of M = 14 with SS = 18 for the scores in the second treatment,and a mean of M = 4 with SS = 12 for the difference scores.What is the estimated standard error for the sample mean difference?​

Accepted Answer

A) ​4 
B) ​3 
C) ​2 
D) ​1 
A) ​4 
B) ​3 
C) ​2 
D) ​1

Individual differences are characteristics such as age,IQ,gender,and personality that vary from one individual to another.

A researcher reports df = 18 for a repeated-measures t statistic.This research study used a total of n = 19 participants.

For which of the following situations would a repeated-measures research design be appropriate?

A researcher plans to conduct a research study comparing two treatment conditions with a total of 20 scores in each treatment.Which of the following designs would require only 20 participants?

For a repeated-measures design,df = n₁ + n₂ - 2 for the t statistic.

A repeated-measures study with a sample of n = 16 participants produces a repeated-measures t = 2.00.If effect size is measured using r²,then r² = 4/20.

A repeated-measures research study uses a total of 20 participants to compare two treatment conditions.If the results are used to construct a 90% confidence interval for the population mean difference,then the t values will be ±1.729.

Which of the following is the correct null hypothesis for a repeated-measures t test?

In a repeated-measures design,or a within-subjects design,one group of participants is measured in two different treatment conditions so there are two separate scores for each individual in the sample.

For the repeated-measures t statistic,where n1 and n2 are the number of scores before and after treatment,and n = n₁= n₂,df = ____.

If the sample size is held constant,which of the following will produce the widest 90% confidence interval for the population mean difference for a repeated-measures study?

In general,what is the effect of an increase in the variance for the sample of difference scores?

For a repeated-measures study comparing two treatments with a sample of n = 9 participants,the difference scores have a mean of M_D = 4.90 with SS = 288.What is the estimated standard error for the sample mean difference?

Introduction to Statistics

Frequency Distributions

Central Tendency

Variability

Z-Scores: Location of Scores and Standardized Distributions

Probability

Probability and Samples: the Distribution of Sample Means

Introduction to Hypothesis Testing

Introduction to the T Statistic

The T Test for Two Independent Samples

Introduction to Analysis of Variance

Repeated-Measures Analysis of Variance Anova

Two-Factor Analysis of Variance Independent Measures

Correlation

Introduction to Regression

The Chi-Square Statistic: Tests for Goodness of Fit and Independence

The Binomial Test

Filters

Exam 11: The T Test for Two Related Samples

Individual differences are characteristics such as age,IQ,gender,and personality that vary from one individual to another.

A researcher reports df = 18 for a repeated-measures t statistic.This research study used a total of n = 19 participants.

For which of the following situations would a repeated-measures research design be appropriate?​

A researcher plans to conduct a research study comparing two treatment conditions with a total of 20 scores in each treatment.Which of the following designs would require only 20 participants?​

For a repeated-measures design,df = n1 + n2 - 2 for the t statistic.

A repeated-measures study with a sample of n = 16 participants produces a repeated-measures t = 2.00.If effect size is measured using r2,then r2 = 4/20.

A repeated-measures research study uses a total of 20 participants to compare two treatment conditions.If the results are used to construct a 90% confidence interval for the population mean difference,then the t values will be ±1.729.

Which of the following is the correct null hypothesis for a repeated-measures t test?​

In a repeated-measures design,or a within-subjects design,one group of participants is measured in two different treatment conditions so there are two separate scores for each individual in the sample.

For the repeated-measures t statistic,where n1 and n2 are the number of scores before and after treatment,and n = n1= n2,df = ____.​

If the sample size is held constant,which of the following will produce the widest 90% confidence interval for the population mean difference for a repeated-measures study?​

In general,what is the effect of an increase in the variance for the sample of difference scores?​

For a repeated-measures study comparing two treatments with a sample of n = 9 participants,the difference scores have a mean of MD = 4.90 with SS = 288.What is the estimated standard error for the sample mean difference?​

Introduction to Statistics

Frequency Distributions

Central Tendency

Variability

Z-Scores: Location of Scores and Standardized Distributions

Probability

Probability and Samples: the Distribution of Sample Means

Introduction to Hypothesis Testing

Introduction to the T Statistic

The T Test for Two Independent Samples

Introduction to Analysis of Variance

Repeated-Measures Analysis of Variance Anova

Two-Factor Analysis of Variance Independent Measures

Correlation

Introduction to Regression

The Chi-Square Statistic: Tests for Goodness of Fit and Independence

The Binomial Test

Filters

For which of the following situations would a repeated-measures research design be appropriate?

A researcher plans to conduct a research study comparing two treatment conditions with a total of 20 scores in each treatment.Which of the following designs would require only 20 participants?

For a repeated-measures design,df = n₁ + n₂ - 2 for the t statistic.

A repeated-measures study with a sample of n = 16 participants produces a repeated-measures t = 2.00.If effect size is measured using r²,then r² = 4/20.

Which of the following is the correct null hypothesis for a repeated-measures t test?

For the repeated-measures t statistic,where n1 and n2 are the number of scores before and after treatment,and n = n₁= n₂,df = ____.

If the sample size is held constant,which of the following will produce the widest 90% confidence interval for the population mean difference for a repeated-measures study?

In general,what is the effect of an increase in the variance for the sample of difference scores?

For a repeated-measures study comparing two treatments with a sample of n = 9 participants,the difference scores have a mean of M_D = 4.90 with SS = 288.What is the estimated standard error for the sample mean difference?