Question 1

The t test assumes that the independent variable affects the _________ of the populations.

Accepted Answer

A)  means 
B)  standard deviations 
C)  means and standard deviations 
D)  none of these 
A)  means 
B)  standard deviations 
C)  means and standard deviations 
D)  none of these

Question 2

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

Accepted Answer

A)  the populations from which the samples were drawn have different standard deviations 
B)  you should use the sign test 
C)  the sample sizes should be equal and N greater than 30 to use the t test 
D)  the populations from which the samples were drawn have different standard deviations and the sample sizes should be equal and N greater than 30 to use the t test 
E)  all of these 
A)  the populations from which the samples were drawn have different standard deviations 
B)  you should use the sign test 
C)  the sample sizes should be equal and N greater than 30 to use the t test 
D)  the populations from which the samples were drawn have different standard deviations and the sample sizes should be equal and N greater than 30 to use the t test 
E)  all of these

Question 3

Using the t test for independent groups, a directional alternative hypothesis predicts _________.

Accepted Answer

A)  µ 1 > µ 2 
B)  µ 1 = µ 2 
C)  µ 1 µ 2 
D)  µ 1 > µ 2 or µ 1 µ 2 , depending on the direction 
A)  µ 1 > µ 2 
B)  µ 1 = µ 2 
C)  µ 1 µ 2 
D)  µ 1 > µ 2 or µ 1 µ 2 , depending on the direction

Question 4

A professor of women's studies is interested in determining if stress affects the menstrual cycle. Ten women are randomly sampled for an experiment and randomly divided into two groups. One of the groups is subjected to high stress for two months while the other lives in a relatively stress-free environment. The professor measures the menstrual cycle (in days) of each woman during the second month. The following data are obtained.   Assume you are evaluating H 0 using the t test with a = .05 2 tail . The correct conclusion is _________.

Accepted Answer

A)  accept H 0; stress does not affect the menstrual cycle 
B)  retain H 0; we cannot conclude that stress affects the menstrual cycle 
C)  retain H 0; stress affects the menstrual cycle 
D)  reject H 0; stress affects the menstrual cycle 
A)  accept H 0; stress does not affect the menstrual cycle 
B)  retain H 0; we cannot conclude that stress affects the menstrual cycle 
C)  retain H 0; stress affects the menstrual cycle 
D)  reject H 0; stress affects the menstrual cycle

Question 5

The sampling distribution of t is different for single samples than for correlated groups.

Accepted Answer

A) True 
 B)False

The t test assumes that the independent variable affects the _________ of the populations.

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

Using the t test for independent groups, a directional alternative hypothesis predicts _________.

The sampling distribution of t is different for single samples than for correlated groups.

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

The t test assumes that the independent variable affects the _________ of the populations.

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

Using the t test for independent groups, a directional alternative hypothesis predicts _________.

The sampling distribution of t is different for single samples than for correlated groups.

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