Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

One sample has n = 5 scores and the second has n = 10 scores.If the pooled variance for the two sample is 30, then what is the value of the estimated standard error for the sample mean difference?

Accepted Answer

A) the square root of (30/15) 
B) the square root of (60/15) 
C) the square root of (30/5 + 30/10) 
D) the square root of (30/4 + 30/9) 
A) the square root of (30/15) 
B) the square root of (60/15) 
C) the square root of (30/5 + 30/10) 
D) the square root of (30/4 + 30/9)

Question 3

For an independent-measures research study, the data show an 8-point difference between the two treatment means and a pooled variance of 4.Given this information, what is the value of Cohen's d?

Accepted Answer

A) 8/4 
B) 8/2 
C) 4/8 
D) Cannot answer without knowing the sample sizes. 
A) 8/4 
B) 8/2 
C) 4/8 
D) Cannot answer without knowing the sample sizes.

Question 4

If the sample mean difference is 3 points, which of the following sets of data would produce the largest value for Cohen's d?

Accepted Answer

A) n = 10 for both samples and a pooled variance of 15 
B) n = 20 for both samples and a pooled variance of 15 
C) n = 30 for both samples and a pooled variance of 15 
D) Cohen's d is the same for all three of the samples. 
A) n = 10 for both samples and a pooled variance of 15 
B) n = 20 for both samples and a pooled variance of 15 
C) n = 30 for both samples and a pooled variance of 15 
D) Cohen's d is the same for all three of the samples.

Question 5

If other factors are held constant, the larger the larger the two sample sizes are, the greater the likelihood that the independent-measures t test will find a significant difference.

Accepted Answer

A) True 
 B)False

Question 6

What is the pooled variance for the following two samples? Sample 1: $ n=8 $ and $ \mathrm{SS}=168 \$ Sample $ 2: \mathrm{n}=6 $ and SS $ =120 $

Accepted Answer

A)  7 
B)  $ \sqrt{7} $ 
C)  $ 20.57 $ 
D)  24 
A)  7 
B)  $ \sqrt{7} $ 
C)  $ 20.57 $ 
D)  24

Question 7

Assuming that there is a 5-point difference between the two sample means, which set of sample characteristics is most likely to produce a significant value for the independent-measures t statistic?

Accepted Answer

A) large sample sizes and small sample variances 
B) large sample sizes and large sample variances 
C) small sample sizes and small sample variances 
D) small sample sizes and large sample variances 
A) large sample sizes and small sample variances 
B) large sample sizes and large sample variances 
C) small sample sizes and small sample variances 
D) small sample sizes and large sample variances

Question 8

Using an independent-measures t, the 90% confidence interval for the difference between two population means ranges from 19 to 23.Based on this confidence interval, you can conclude that the difference between the two sample means is _____.

Accepted Answer

A) 4 points 
B) 19 points 
C) 21 points 
D) 23 points 
A) 4 points 
B) 19 points 
C) 21 points 
D) 23 points

Question 9

The results from an independent-measures t hypothesis test are reported as "t(24) = 3.85,
p < .01, two tailed." The research study for this test used a total of 26 subjects.

Accepted Answer

A) True 
 B)False

Question 10

A researcher reports an independent-measures t statistic with df = 30.If the two samples are the same size (n1 = n2), then how many individuals are in each sample?

Accepted Answer

A) n = 15 
B) n = 16 
C) n = 30 
D) n = 31 
A) n = 15 
B) n = 16 
C) n = 30 
D) n = 31

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

One sample has n = 5 scores and the second has n = 10 scores.If the pooled variance for the two sample is 30, then what is the value of the estimated standard error for the sample mean difference?

For an independent-measures research study, the data show an 8-point difference between the two treatment means and a pooled variance of 4.Given this information, what is the value of Cohen's d?

If the sample mean difference is 3 points, which of the following sets of data would produce the largest value for Cohen's d?

If other factors are held constant, the larger the larger the two sample sizes are, the greater the likelihood that the independent-measures t test will find a significant difference.

What is the pooled variance for the following two samples? Sample 1: $n=8$ and $\mathrm{SS}=168 \\$ Sample $2: \mathrm{n}=6$ and SS $=120$

Assuming that there is a 5-point difference between the two sample means, which set of sample characteristics is most likely to produce a significant value for the independent-measures t statistic?

Using an independent-measures t, the 90% confidence interval for the difference between two population means ranges from 19 to 23.Based on this confidence interval, you can conclude that the difference between the two sample means is _____.

The results from an independent-measures t hypothesis test are reported as "t(24) = 3.85, p < .01, two tailed." The research study for this test used a total of 26 subjects.

A researcher reports an independent-measures t statistic with df = 30.If the two samples are the same size (n₁ = n₂), then how many individuals are in each sample?

Introduction to Statistics

Frequency Distributions

Central Tendency

Variability

Z-Scores

Probability

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 Anova

Two-Factor Analysis of Variance

Correlation

Introduction to Regression

Chi-Square Tests

The Binomial Test

Choosing the Right Statistics

Filters

Exam 10: The T Test for Two Independent Samples

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

One sample has n = 5 scores and the second has n = 10 scores.If the pooled variance for the two sample is 30, then what is the value of the estimated standard error for the sample mean difference?

For an independent-measures research study, the data show an 8-point difference between the two treatment means and a pooled variance of 4.Given this information, what is the value of Cohen's d?

If the sample mean difference is 3 points, which of the following sets of data would produce the largest value for Cohen's d?

If other factors are held constant, the larger the larger the two sample sizes are, the greater the likelihood that the independent-measures t test will find a significant difference.

What is the pooled variance for the following two samples? Sample 1: n=8 n=8 n=8 and SS=168 \mathrm{SS}=168 \\SS=168 Sample 2:n=6 2: \mathrm{n}=6 2:n=6 and SS =120 =120 =120

Assuming that there is a 5-point difference between the two sample means, which set of sample characteristics is most likely to produce a significant value for the independent-measures t statistic?

Using an independent-measures t, the 90% confidence interval for the difference between two population means ranges from 19 to 23.Based on this confidence interval, you can conclude that the difference between the two sample means is _____.

The results from an independent-measures t hypothesis test are reported as "t(24) = 3.85, p < .01, two tailed." The research study for this test used a total of 26 subjects.

A researcher reports an independent-measures t statistic with df = 30.If the two samples are the same size (n1 = n2), then how many individuals are in each sample?

Introduction to Statistics

Frequency Distributions

Central Tendency

Variability

Z-Scores

Probability

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 Anova

Two-Factor Analysis of Variance

Correlation

Introduction to Regression

Chi-Square Tests

The Binomial Test

Choosing the Right Statistics

Filters

What is the pooled variance for the following two samples? Sample 1: $n=8$ and $\mathrm{SS}=168 \\$ Sample $2: \mathrm{n}=6$ and SS $=120$

A researcher reports an independent-measures t statistic with df = 30.If the two samples are the same size (n₁ = n₂), then how many individuals are in each sample?