Exam 10: The t Test for Two Independent Samples

An independent-measures research study uses a total of 18 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 ±1.746.

(True/False)

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Question 21

If both samples have the same number of scores (n),then the independent-measures t statistic will have df = 2n - 2.

(True/False)

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Question 22

A research study compares the mean weight for a sample of n = 36 participants before they begin a 6-week diet and their mean weight at the end of the diet.This is an example of an independent-measures design.

(True/False)

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Question 23

Two samples each have n = 4 scores.If the first sample has a variance of 10 and the second sample has a variance of 6,what is the estimated standard error for the sample mean difference?

(Multiple Choice)

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Question 24

An independent-measures study produces sample means of M₁ = 20 and M₂ = 17.If both samples have n = 18 scores and Cohen's d = 0.50,what is the value for the pooled variance?

(Multiple Choice)

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Question 25

The homogeneity of variance assumption states that the two population variances are equal.

(True/False)

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Question 26

The narrower the confidence interval,the more precise it is.With this in mind,which combination of factors will produce the most precise estimate of the difference between two population means?

(Multiple Choice)

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Question 27

An independent-measures study comparing two treatment conditions with n = 6 in each sample produces t = 4.00.What is the value of r² for this study?

(Multiple Choice)

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Question 28

An independent-measures study produces t(10)= 3.00,p < .05.For this study,if effect size is measured with r²,then r² = 3/13.

(True/False)

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Question 29

If an independent-measures t statistic has df = 20,then a total of 18 individuals participated in the research study.

(True/False)

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Question 30

An independent-measures study uses n = 15 participants in each group to compare two treatment conditions.What is the df value for the t statistic for this study?

(Multiple Choice)

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Question 31

Two samples,each with n = 5 scores,have a pooled variance of 40.What is the estimated standard error for the sample mean difference?

(Multiple Choice)

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Question 32

Two samples,each with n = 4 scores,have a pooled variance of 32.The estimated standard error for the sample mean difference is √8.

(True/False)

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Question 33

An independent-measures study with n = 6 in each sample produces a sample mean difference of 4 points and a pooled variance of 12.What is the value for the t statistic?

(Multiple Choice)

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Question 34

Which of the following confidence intervals also indicates a significant difference between treatments with α = .05?

(Multiple Choice)

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Question 35

When pooling variances,the resulting value will be closer to the variance for the sample with the smaller number of scores.

(True/False)

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Question 36

Two samples,each with n = 16 scores,produce an estimated standard error of 4 points and a t statistic of t = 2.00.What is the sample mean difference?

(Multiple Choice)

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Question 37

One sample has n = 7 scores with SS = 40,and a second sample has n = 5 scores with SS = 80.The pooled variance for these two samples is 120/10 = 12.

(True/False)

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Question 38

An independent-measures research study uses a total of 40 participants to compare two treatment conditions.What is the df value for the t statistic for this study?

(Multiple Choice)

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Question 39

Which combination of factors is most likely to produce a significant value for an independent-measures t statistic?

(Multiple Choice)

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Question 40

Showing 21 - 40 of 84

An independent-measures research study uses a total of 18 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 ±1.746.

If both samples have the same number of scores (n),then the independent-measures t statistic will have df = 2n - 2.

A research study compares the mean weight for a sample of n = 36 participants before they begin a 6-week diet and their mean weight at the end of the diet.This is an example of an independent-measures design.

Two samples each have n = 4 scores.If the first sample has a variance of 10 and the second sample has a variance of 6,what is the estimated standard error for the sample mean difference?

An independent-measures study produces sample means of M₁ = 20 and M₂ = 17.If both samples have n = 18 scores and Cohen's d = 0.50,what is the value for the pooled variance?

The homogeneity of variance assumption states that the two population variances are equal.

The narrower the confidence interval,the more precise it is.With this in mind,which combination of factors will produce the most precise estimate of the difference between two population means?

An independent-measures study comparing two treatment conditions with n = 6 in each sample produces t = 4.00.What is the value of r² for this study?

An independent-measures study produces t(10)= 3.00,p < .05.For this study,if effect size is measured with r²,then r² = 3/13.

If an independent-measures t statistic has df = 20,then a total of 18 individuals participated in the research study.

An independent-measures study uses n = 15 participants in each group to compare two treatment conditions.What is the df value for the t statistic for this study?

Two samples,each with n = 5 scores,have a pooled variance of 40.What is the estimated standard error for the sample mean difference?

Two samples,each with n = 4 scores,have a pooled variance of 32.The estimated standard error for the sample mean difference is √8.

An independent-measures study with n = 6 in each sample produces a sample mean difference of 4 points and a pooled variance of 12.What is the value for the t statistic?

Which of the following confidence intervals also indicates a significant difference between treatments with α = .05?

When pooling variances,the resulting value will be closer to the variance for the sample with the smaller number of scores.

Two samples,each with n = 16 scores,produce an estimated standard error of 4 points and a t statistic of t = 2.00.What is the sample mean difference?

One sample has n = 7 scores with SS = 40,and a second sample has n = 5 scores with SS = 80.The pooled variance for these two samples is 120/10 = 12.

An independent-measures research study uses a total of 40 participants to compare two treatment conditions.What is the df value for the t statistic for this study?

Which combination of factors is most likely to produce a significant value for an independent-measures t statistic?

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 Related Samples

Introduction to Analysis of Variance

Repeated-Measures and Two-Factor Analysis of Variance

Correlation and Regression.

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

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