Question 1

For the independent groups t test,   gives a value in raw score units for the size of effect.

Accepted Answer

A) True 
 B)False

Question 2

Accepted Answer

A) True 
 B)False

Question 3

Five students were tested before and after taking a class to improve their study habits. They were given articles to read which contained a known number of facts in each story. After the story each student listed as many facts as he/she could recall. The following data was recorded.   What do you conclude using a = 0.052 tail?

Accepted Answer

A)  reject H0; the class appeared to improve study habits 
B)  retain H0;  the class had no effect on study habits 
C)  retain H0; we cannot conclude that the class improved study habits 
D)  accept H0; the class appeared to improve study habits 
A)  reject H0; the class appeared to improve study habits 
B)  retain H0;  the class had no effect on study habits 
C)  retain H0; we cannot conclude that the class improved study habits 
D)  accept H0; the class appeared to improve study habits

Question 4

If the correlation is zero between paired scores, the t test for correlated groups is more powerful than the t test for independent groups.

Accepted Answer

A) True 
 B)False

Question 5

In a repeated measures design the difference scores are used in the analysis, not the raw scores.

Accepted Answer

A) True 
 B)False

Question 6

The t test for correlated groups uses both the magnitude and direction of the difference scores.

Accepted Answer

A) True 
 B)False

Question 7

When several tests are appropriate for analyzing data, it is best to use the least powerful test so as to minimize the probability of making a Type I error.

Accepted Answer

A) True 
 B)False

Question 8

One way of stating H0 for the t test for independent groups is µ 1 - µ 2 = 0. (Assume H1 is nondirectional)

Accepted Answer

A) True 
 B)False

Question 9

If the homogeneity of variance assumption is violated in an experiment using the t test for independent groups, this means _________.

Accepted Answer

A)  the populations from which the samples were drawn have different variances 
B)  the power of the t test will be reduced 
C)  t the test can still be used, if the violation is a moderate one 
D)  the t test should not be used 
E)  the populations from which the samples were drawn have different variances and t the test can still be used, if the violation is a moderate one 
A)  the populations from which the samples were drawn have different variances 
B)  the power of the t test will be reduced 
C)  t the test can still be used, if the violation is a moderate one 
D)  the t test should not be used 
E)  the populations from which the samples were drawn have different variances and t the test can still be used, if the violation is a moderate one

Question 10

If the confidence interval for µ 1 - µ 2 contains the value 0, we can reject H 0.

Accepted Answer

A) True 
 B)False

Question 11

Assuming large between subject variability, which of the following tests is usually the most sensitive ( N held constant)?

Accepted Answer

A)  t test for correlated groups 
B)  sign test 
C)  t test for independent groups 
D)  they are all equal in sensitivity 
A)  t test for correlated groups 
B)  sign test 
C)  t test for independent groups 
D)  they are all equal in sensitivity

Question 12

If the homogeneity of variance assumption is not met, it is invalid to use the t test for independent groups.

Accepted Answer

A) True 
 B)False

Question 13

In an independent groups design the nondirectional alternative hypothesis states _________.

Accepted Answer

A) µ 1 > µ 2 B) µ 1< µ 2 C) µ 1 ≠ µ 2 D) µ 1 = µ 2 A) µ 1 > µ 2 B) µ 1< µ 2 C) µ 1 ≠ µ 2 D) µ 1 = µ 2

Question 14

The z test for independent groups is seldom used because s 2 is unknown.

Accepted Answer

A) True 
 B)False

Question 15

When using the correlated groups t test, the larger the size of effect the larger is

Accepted Answer

A) True 
 B)False

Question 16

In testing the null hypothesis, the correlated t test allows one to utilize information on _________ in the test of significance.

Accepted Answer

A)  magnitude and direction 
B)  magnitude only 
C)  direction only 
D)  separation between the groups 
A)  magnitude and direction 
B)  magnitude only 
C)  direction only 
D)  separation between the groups

Question 17

When using the confidence interval approach for evaluating the effect of the independent variable, if the 95% confidence interval contains the value "0", we can reject H 0 at á = 0.05.

Accepted Answer

A) True 
 B)False

Question 18

If the independent variable has a real effect, the t test for independent groups assumes s 12 = s 22 .

Accepted Answer

A) True 
 B)False

Question 19

The t test for correlated groups requires the sampling distribution of   be normally distributed.

Accepted Answer

A) True 
 B)False

Question 20

The sampling distribution of   has a mean value equal to _________.

Accepted Answer

A)  0 
B)    
C)  N 
D)    
A)  0 
B)    
C)  N 
D)

For the independent groups t test, gives a value in raw score units for the size of effect.

If the correlation is zero between paired scores, the t test for correlated groups is more powerful than the t test for independent groups.

In a repeated measures design the difference scores are used in the analysis, not the raw scores.

The t test for correlated groups uses both the magnitude and direction of the difference scores.

When several tests are appropriate for analyzing data, it is best to use the least powerful test so as to minimize the probability of making a Type I error.

One way of stating H₀ for the t test for independent groups is µ 1 - µ 2 = 0. (Assume H₁ is nondirectional)

If the homogeneity of variance assumption is violated in an experiment using the t test for independent groups, this means _________.

If the confidence interval for µ 1 - µ 2 contains the value 0, we can reject H ₀.

Assuming large between subject variability, which of the following tests is usually the most sensitive ( N held constant)?

If the homogeneity of variance assumption is not met, it is invalid to use the t test for independent groups.

In an independent groups design the nondirectional alternative hypothesis states _________.

The z test for independent groups is seldom used because s 2 is unknown.

When using the correlated groups t test, the larger the size of effect the larger is

In testing the null hypothesis, the correlated t test allows one to utilize information on _________ in the test of significance.

When using the confidence interval approach for evaluating the effect of the independent variable, if the 95% confidence interval contains the value "0", we can reject H ₀ at á = 0.05.

If the independent variable has a real effect, the t test for independent groups assumes s ₁² = s ₂² .

The t test for correlated groups requires the sampling distribution of be normally distributed.

The sampling distribution of has a mean value equal to _________.

Statistics and Scientific Method

Basic Mathematical and Measurement Concepts

Frequency Distributions

Measures of Central Tendency and Variability

The Normal Curve and Standard Scores

Correlation

Linear Regression

Random Sampling and Probability

Binomial Distribution

Introduction to Hypothesis Testing: Using the Sign Test

Power

Sampling Distributions, Sampling Distribution of the Mean: the Normal Deviate Z Test

Students T Test for Single Samples

Introduction to the Analysis of Variance

Introduction to the Two-Way Analysis of Variance

Chi-Square and Other Nonparametric Tests

Filters

Exam 14: Students T Test for Correlated and Independent Groups

For the independent groups t test, gives a value in raw score units for the size of effect.

If the correlation is zero between paired scores, the t test for correlated groups is more powerful than the t test for independent groups.

In a repeated measures design the difference scores are used in the analysis, not the raw scores.

The t test for correlated groups uses both the magnitude and direction of the difference scores.

When several tests are appropriate for analyzing data, it is best to use the least powerful test so as to minimize the probability of making a Type I error.

One way of stating H0 for the t test for independent groups is µ 1 - µ 2 = 0. (Assume H1 is nondirectional)

If the homogeneity of variance assumption is violated in an experiment using the t test for independent groups, this means _________.

If the confidence interval for µ 1 - µ 2 contains the value 0, we can reject H 0.

Assuming large between subject variability, which of the following tests is usually the most sensitive ( N held constant)?

If the homogeneity of variance assumption is not met, it is invalid to use the t test for independent groups.

In an independent groups design the nondirectional alternative hypothesis states _________.

The z test for independent groups is seldom used because s 2 is unknown.

When using the correlated groups t test, the larger the size of effect the larger is

In testing the null hypothesis, the correlated t test allows one to utilize information on _________ in the test of significance.

When using the confidence interval approach for evaluating the effect of the independent variable, if the 95% confidence interval contains the value "0", we can reject H 0 at á = 0.05.

If the independent variable has a real effect, the t test for independent groups assumes s 12 = s 22 .

The t test for correlated groups requires the sampling distribution of be normally distributed.

The sampling distribution of has a mean value equal to _________.

Statistics and Scientific Method

Basic Mathematical and Measurement Concepts

Frequency Distributions

Measures of Central Tendency and Variability

The Normal Curve and Standard Scores

Correlation

Linear Regression

Random Sampling and Probability

Binomial Distribution

Introduction to Hypothesis Testing: Using the Sign Test

Power

Sampling Distributions, Sampling Distribution of the Mean: the Normal Deviate Z Test

Students T Test for Single Samples

Introduction to the Analysis of Variance

Introduction to the Two-Way Analysis of Variance

Chi-Square and Other Nonparametric Tests

Filters

One way of stating H₀ for the t test for independent groups is µ 1 - µ 2 = 0. (Assume H₁ is nondirectional)

If the confidence interval for µ 1 - µ 2 contains the value 0, we can reject H ₀.

When using the confidence interval approach for evaluating the effect of the independent variable, if the 95% confidence interval contains the value "0", we can reject H ₀ at á = 0.05.

If the independent variable has a real effect, the t test for independent groups assumes s ₁² = s ₂² .