Question 1

If H0 is true, then µ D must equal 0 for a correlated groups design.

Accepted Answer

A) True 
 B)False

Question 2

In the t test for independent samples, there are _________ degrees of freedom.

Accepted Answer

A)  n 1 - 1 
B)  n 1 + n 2 
C)  n 1 - n 2 + 2 
D)  n 1 + n 2 - 2 
A)  n 1 - 1 
B)  n 1 + n 2 
C)  n 1 - n 2 + 2 
D)  n 1 + n 2 - 2

Question 3

A biologist believes that temperature affects the croaking (noise making, not dying) behavior of frogs. A group of laboratory frogs are randomly divided into 2 groups and placed in identical terrariums. The control group of frogs' is kept at a constant 22 ° C. The experimental group is kept at a temperature of 30 ° C. The number of croaks emitted over a 10-minute period are counted. The data are as follows:

Accepted Answer

The answer of A biologist believes that temperature affects the...

Question 4

In a correlated groups design, the reasonableness of the null hypothesis is usually tested by assuming the sample set of difference scores is a random sample from a population of difference scores with µ D = 0.

Accepted Answer

A) True 
 B)False

Question 5

Student's t test for correlated groups really reduces to _________.

Accepted Answer

A)  the sign test 
B)  Student's t test for single samples using difference scores 
C)  Students t test for independent groups 
D)  none of these 
A)  the sign test 
B)  Student's t test for single samples using difference scores 
C)  Students t test for independent groups 
D)  none of these

Question 6

Using the independent groups t test, the size of the effect of the independent variable can be estimated using _________.

Accepted Answer

A)  t obt 
B)  r obt 
C)    
D)  r 2 
A)  t obt 
B)  r obt 
C)    
D)  r 2

Question 7

The power of a correlated t test increases if the correlation between the paired scores is _________.

Accepted Answer

A)  0 
B)  high 
C)  low 
D)  cannot be determined 
A)  0 
B)  high 
C)  low 
D)  cannot be determined

Question 8

Using Cohen's criteria, the size of effect found in problem 54 is _________.

Accepted Answer

A)  small 
B)  medium 
C)  large 
D)  Cohen's criteria doesn't apply 
A)  small 
B)  medium 
C)  large 
D)  Cohen's criteria doesn't apply

Question 9

The null hypothesis for a nondirectional H 1 using the t test for correlated groups asserts that _________.

Accepted Answer

A)  µ 1 - µ 2 = 0 
B)  µ D = 0 
C)    = 0 
D)  D -   = 0 
E)  none of these 
A)  µ 1 - µ 2 = 0 
B)  µ D = 0 
C)    = 0 
D)  D -   = 0 
E)  none of these

Question 10

The t test for correlated groups is just like the t test for single samples except that it analyzes difference scores.

Accepted Answer

A) True 
 B)False

Question 11

Consider the following data collected from a repeated measures design study.

Accepted Answer

The answer of Consider the following data collected from a...

Question 12

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.   The obtained value of the appropriate statistic for evaluating H 0 is _________.

Accepted Answer

A)  t obt = - 4.73 
B)  t obt = - 4.71 
C)  t obt = - 3.05 
D)  t obt = - 0.47 
A)  t obt = - 4.73 
B)  t obt = - 4.71 
C)  t obt = - 3.05 
D)  t obt = - 0.47

Question 13

In analyzing the results of the correlated t test, the _________ scores are analyzed.

Accepted Answer

A)  standardized 
B)  normalized 
C)  raw 
D)  difference 
A)  standardized 
B)  normalized 
C)  raw 
D)  difference

Question 14

A teacher wishes to test the effects of using reinforcement versus a conventional method for maintaining classroom deportment. Twenty different teachers are instructed on the techniques to be used in the study; 10 on the conventional method and 10 on using reinforcement. Data was gathered on the number of minutes of attentive behavior in an hour sample taken from a class of each teacher when the classes were being taught the same material. The classrooms were chosen because they were not significantly different in terms of socioeconomic status or past educational experiences. The data are as follows:

Accepted Answer

The answer of A teacher wishes to test the effects...

Question 15

In the t test for independent groups, _________.

Accepted Answer

A)  we estimate µ 1 - µ 2 
B)  we estimate s 2 
C)  we estimate   
D)  df = N - 1 
A)  we estimate µ 1 - µ 2 
B)  we estimate s 2 
C)  we estimate   
D)  df = N - 1

Question 16

Define t test for independent groups.

Accepted Answer

The t-test for independent groups, also

Question 17

Define independent groups design.

Accepted Answer

An independent groups design, also known

Question 18

The z test for independent groups is almost never used because it requires that _________ be known.

Accepted Answer

A)  µ 1 
B)    
C)  s 2 
D)  s 2. 
A)  µ 1 
B)    
C)  s 2 
D)  s 2.

Question 19

Other factors held constant, for an independent groups design, the larger the value of   , the greater the likelihood of rejecting H0 .

Accepted Answer

A) True 
 B)False

Question 20

In the independent groups design there is no matching of subjects and each subject is tested only once.

Accepted Answer

A) True 
 B)False

If H₀ is true, then µ D must equal 0 for a correlated groups design.

In the t test for independent samples, there are _________ degrees of freedom.

In a correlated groups design, the reasonableness of the null hypothesis is usually tested by assuming the sample set of difference scores is a random sample from a population of difference scores with µ D = 0.

Student's t test for correlated groups really reduces to _________.

Using the independent groups t test, the size of the effect of the independent variable can be estimated using _________.

The power of a correlated t test increases if the correlation between the paired scores is _________.

Using Cohen's criteria, the size of effect found in problem 54 is _________.

The null hypothesis for a nondirectional H 1 using the t test for correlated groups asserts that _________.

The t test for correlated groups is just like the t test for single samples except that it analyzes difference scores.

Consider the following data collected from a repeated measures design study.

In analyzing the results of the correlated t test, the _________ scores are analyzed.

In the t test for independent groups, _________.

Define t test for independent groups.

Define independent groups design.

The z test for independent groups is almost never used because it requires that _________ be known.

Other factors held constant, for an independent groups design, the larger the value of , the greater the likelihood of rejecting H₀ .

In the independent groups design there is no matching of subjects and each subject is tested only once.

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

If H0 is true, then µ D must equal 0 for a correlated groups design.

In the t test for independent samples, there are _________ degrees of freedom.

In a correlated groups design, the reasonableness of the null hypothesis is usually tested by assuming the sample set of difference scores is a random sample from a population of difference scores with µ D = 0.

Student's t test for correlated groups really reduces to _________.

Using the independent groups t test, the size of the effect of the independent variable can be estimated using _________.

The power of a correlated t test increases if the correlation between the paired scores is _________.

Using Cohen's criteria, the size of effect found in problem 54 is _________.

The null hypothesis for a nondirectional H 1 using the t test for correlated groups asserts that _________.

The t test for correlated groups is just like the t test for single samples except that it analyzes difference scores.

Consider the following data collected from a repeated measures design study.

In analyzing the results of the correlated t test, the _________ scores are analyzed.

In the t test for independent groups, _________.

Define t test for independent groups.

Define independent groups design.

The z test for independent groups is almost never used because it requires that _________ be known.

Other factors held constant, for an independent groups design, the larger the value of , the greater the likelihood of rejecting H0 .

In the independent groups design there is no matching of subjects and each subject is tested only once.

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

If H₀ is true, then µ D must equal 0 for a correlated groups design.

Other factors held constant, for an independent groups design, the larger the value of , the greater the likelihood of rejecting H₀ .