Question 1

To determine the extent to which the conditions of the independent variable determine dependent scores,we should compute

Accepted Answer

A) the effect size. 
B) an independent samples t-test. 
C) a related samples t-test. 
D) the standard error of the difference between means. 
A) the effect size. 
B) an independent samples t-test. 
C) a related samples t-test. 
D) the standard error of the difference between means.

Question 2

How does increasing the size of the samples increase the power of an experiment?

Accepted Answer

A) Larger numbers of subjects result in smaller degrees of freedom,which results in a smaller value of   . 
B) Larger numbers of subjects result in larger degrees of freedom,which results in a larger value of   . 
C) Larger numbers of subjects result in larger degrees of freedom,which results in a smaller value of   . 
D) Larger numbers of subjects result in smaller degrees of freedom,which results in a larger value of   . 
A) Larger numbers of subjects result in smaller degrees of freedom,which results in a smaller value of   . 
B) Larger numbers of subjects result in larger degrees of freedom,which results in a larger value of   . 
C) Larger numbers of subjects result in larger degrees of freedom,which results in a smaller value of   . 
D) Larger numbers of subjects result in smaller degrees of freedom,which results in a larger value of   .

Question 3

What is pooled variance?

Accepted Answer

A) The weighted average of the two sample variances. 
B) The variance of the difference between the sample means. 
C) The sum of the two sample variances. 
D) The variance of the populations from which the samples were drawn. 
A) The weighted average of the two sample variances. 
B) The variance of the difference between the sample means. 
C) The sum of the two sample variances. 
D) The variance of the populations from which the samples were drawn.

Question 4

When   is true,the mean of the sampling distribution of differences between means is equal to

Accepted Answer

A) the population mean µ. 
B) 1.0. 
C) the mean of the two sample means. 
D) zero. 
A) the population mean µ. 
B) 1.0. 
C) the mean of the two sample means. 
D) zero.

Question 5

Suppose you tested two age groups on the number of details they could recall from a paragraph.The mean for the older group is 16,and the mean for the younger group is 14.Further suppose that you fail to reject the null hypothesis for this independent samples t-test.Which of the following best accounts for the difference between these sample means?

Accepted Answer

A) A math error has been made somewhere. 
B) The null hypothesis was incorrect to start with. 
C) The sample means probably came from different populations,and the difference is due to sampling error. 
D) The sample means probably came from the same population,and the difference is due to sampling error. 
A) A math error has been made somewhere. 
B) The null hypothesis was incorrect to start with. 
C) The sample means probably came from different populations,and the difference is due to sampling error. 
D) The sample means probably came from the same population,and the difference is due to sampling error.

Question 6

How is the t-test for related samples performed?

Accepted Answer

A) By conducting a one-sample t-test on the sample of difference scores 
B) By conducting an independent samples t-test on the sample of difference scores 
C) By converting the scores to standard scores and then performing a related samples t-test 
D) By measuring the population variance and testing it using an independent samples t-test 
A) By conducting a one-sample t-test on the sample of difference scores 
B) By conducting an independent samples t-test on the sample of difference scores 
C) By converting the scores to standard scores and then performing a related samples t-test 
D) By measuring the population variance and testing it using an independent samples t-test

Question 7

The sampling distribution of differences between means is the distribution of all possible

Accepted Answer

A) sample means. 
B) differences between two means when they are drawn from two raw score populations 
C) differences between two means when they are drawn from one raw score population. 
D) differences between two means of various sample sizes. 
A) sample means. 
B) differences between two means when they are drawn from two raw score populations 
C) differences between two means when they are drawn from one raw score population. 
D) differences between two means of various sample sizes.

Question 8

Which of the following is not one of the assumptions of the t-test for independent samples?

Accepted Answer

A) The populations of raw scores form normal distributions. 
B) Their dependent scores measure an interval/ratio variable. 
C) There is homogeneity of variance. 
D) The standard deviation of at least one of the populations is known. 
A) The populations of raw scores form normal distributions. 
B) Their dependent scores measure an interval/ratio variable. 
C) There is homogeneity of variance. 
D) The standard deviation of at least one of the populations is known.

Question 9

There are two ways in which samples can be related.In a _____ design,each participant in one condition is paired with a participant in the other condition.In a _____ design,each participant is tested under both conditions of the independent variable.

Accepted Answer

A) repeated-measures;matched-samples 
B) matched-samples;repeated-measures 
C) dependent-samples;related-samples 
D) related-samples;dependent-samples 
A) repeated-measures;matched-samples 
B) matched-samples;repeated-measures 
C) dependent-samples;related-samples 
D) related-samples;dependent-samples

Question 10

Two samples are said to be independent when

Accepted Answer

A) we randomly select participants for a sample,without regard to who has been selected for either sample. 
B) we randomly select participants for a sample,being sure to pair each person in one sample with a particular person in the other sample. 
C) we randomly select participants for a sample,being sure that each participant serves in every condition of our experiment. 
D) the null hypothesis of the two-sample t-test is rejected. 
A) we randomly select participants for a sample,without regard to who has been selected for either sample. 
B) we randomly select participants for a sample,being sure to pair each person in one sample with a particular person in the other sample. 
C) we randomly select participants for a sample,being sure that each participant serves in every condition of our experiment. 
D) the null hypothesis of the two-sample t-test is rejected.

Question 11

Julius has conducted a very small study of the amount of sleep his dorm mates get each night.He believes that those who are on one of the school's sports teams will get more sleep than those who are not.Julius asked 6 people in his dorm who do not play sports and 6 who do play sports to participate.Because he thinks that the number of credit hours a student is taking also might impact sleep habits,he matched each person in the "plays sports" group with a person in the "does not play sports" group who was carrying the same number of hours.The descriptive statistics from his survey are given below.Conduct an appropriate one-tailed t-test using   and determine the tobt.

Accepted Answer

A) t(5)= 2.35 
B) t(5)= 2.28 
C) t(10)= 1.80 
D) t(10)= 1.75 
A) t(5)= 2.35 
B) t(5)= 2.28 
C) t(10)= 1.80 
D) t(10)= 1.75

Question 12

For a study with a related-samples design and 30 participants in which each participant is measured twice (repeated measures),what is the critical value? Assume a two-tailed test with F1F1F1S1F1F1F10 = 0.05.

Accepted Answer

A) 1.699 
B) 2.042 
C) 2.045 
D) 2.048 
A) 1.699 
B) 2.042 
C) 2.045 
D) 2.048

Question 13

If   and   ,what is   ?

Accepted Answer

A) 1.41 
B) 2.0 
C) 4.47 
D) 20 
A) 1.41 
B) 2.0 
C) 4.47 
D) 20

Question 14

Unless otherwise specified,what is   said to equal?

Accepted Answer

A)    
B) 1 
C) 0 
D)    
A)    
B) 1 
C) 0 
D)

Question 15

What does the alternative hypothesis state in a two-tailed independent samples experiment?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 16

Julius has conducted a very small study of the amount of sleep his dorm mates get each night.He believes that those who are on one of the school's sports teams will get more sleep than those who are not.Julius surveyed 12 people.Of these,6 played on a sports team and 6 did not.The descriptive statistics from his survey are given below.What is   ?

Accepted Answer

A) t(5)= 2.35 
B) t(5)= 2.28 
C) t(10)= 1.80 
D) t(10)= 1.75 
A) t(5)= 2.35 
B) t(5)= 2.28 
C) t(10)= 1.80 
D) t(10)= 1.75

Question 17

When one has the option,a related-samples design should be chosen over an independent samples design because

Accepted Answer

A) related samples result in more variability,and therefore the design is more powerful. 
B) related samples result in less variability,and therefore the design is more powerful. 
C) related samples designs are simpler to use. 
D) related samples designs are intrinsically better than independent samples designs. 
A) related samples result in more variability,and therefore the design is more powerful. 
B) related samples result in less variability,and therefore the design is more powerful. 
C) related samples designs are simpler to use. 
D) related samples designs are intrinsically better than independent samples designs.

Question 18

N represents _____,whereas n represents _____.

Accepted Answer

A) the total number of scores in the study;the number of scores in each sample 
B) the number of scores in each sample;the total number of scores in the study 
C) the number of pairs in the study;the number of difference scores in the study 
D) the number of difference scores in the study;the number of pairs in the study 
A) the total number of scores in the study;the number of scores in each sample 
B) the number of scores in each sample;the total number of scores in the study 
C) the number of pairs in the study;the number of difference scores in the study 
D) the number of difference scores in the study;the number of pairs in the study

Question 19

The nutrition class conducted a taste test in which 10 students rated the taste of regular oleo margarine and also rated the taste of fat-free oleo margarine.In a t-test for related samples,   ,and   .Construct a 95% confidence interval.

Accepted Answer

A)    
B)    4 
C)    
D)    
A)    
B)    4 
C)    
D)

Question 20

How many subjects participated in an independent samples t-test if a researcher reports df=20 and   = 3.68?

Accepted Answer

A) 22 
B) 21 
C) 20 
D) 18 
A) 22 
B) 21 
C) 20 
D) 18

To determine the extent to which the conditions of the independent variable determine dependent scores,we should compute

How does increasing the size of the samples increase the power of an experiment?

What is pooled variance?

When is true,the mean of the sampling distribution of differences between means is equal to

How is the t-test for related samples performed?

The sampling distribution of differences between means is the distribution of all possible

Which of the following is not one of the assumptions of the t-test for independent samples?

There are two ways in which samples can be related.In a _ design,each participant in one condition is paired with a participant in the other condition.In a _ design,each participant is tested under both conditions of the independent variable.

Two samples are said to be independent when

For a study with a related-samples design and 30 participants in which each participant is measured twice (repeated measures),what is the critical value? Assume a two-tailed test with  = 0.05.

If and ,what is ?

Unless otherwise specified,what is said to equal?

What does the alternative hypothesis state in a two-tailed independent samples experiment?

When one has the option,a related-samples design should be chosen over an independent samples design because

N represents _,whereas n represents _.

The nutrition class conducted a taste test in which 10 students rated the taste of regular oleo margarine and also rated the taste of fat-free oleo margarine.In a t-test for related samples, ,and .Construct a 95% confidence interval.

How many subjects participated in an independent samples t-test if a researcher reports df=20 and = 3.68?

Introduction to Statistics

Statistics and the Research Process

Frequency Distributions and Percentiles

Measures of Central Tendency;the Mean, median, and Mode

Measures of Variability: Range, variance, and Standard Deviation

Z-Scores and the Normal Curve

The Correlation Coefficient

Linear Regression

Using Probability to Make Decisions About Data

Introduction to Hypothesis Testing

Performing the One-Sample T-Test and Testing Correlation Coefficients

The One-Way Analysis of Variance

The Two-Way Analysis of Variance

Chi Square and Other Nonparametric Procedures

Filters

Exam 12: The Two-Sample T-Test

To determine the extent to which the conditions of the independent variable determine dependent scores,we should compute

How does increasing the size of the samples increase the power of an experiment?

What is pooled variance?

When is true,the mean of the sampling distribution of differences between means is equal to

How is the t-test for related samples performed?

The sampling distribution of differences between means is the distribution of all possible

Which of the following is not one of the assumptions of the t-test for independent samples?

There are two ways in which samples can be related.In a _____ design,each participant in one condition is paired with a participant in the other condition.In a _____ design,each participant is tested under both conditions of the independent variable.

Two samples are said to be independent when

For a study with a related-samples design and 30 participants in which each participant is measured twice (repeated measures),what is the critical value? Assume a two-tailed test with  = 0.05.

If and ,what is ?

Unless otherwise specified,what is said to equal?

What does the alternative hypothesis state in a two-tailed independent samples experiment?

When one has the option,a related-samples design should be chosen over an independent samples design because

N represents _____,whereas n represents _____.

The nutrition class conducted a taste test in which 10 students rated the taste of regular oleo margarine and also rated the taste of fat-free oleo margarine.In a t-test for related samples, ,and .Construct a 95% confidence interval.

How many subjects participated in an independent samples t-test if a researcher reports df=20 and = 3.68?

Introduction to Statistics

Statistics and the Research Process

Frequency Distributions and Percentiles

Measures of Central Tendency;the Mean, median, and Mode

Measures of Variability: Range, variance, and Standard Deviation

Z-Scores and the Normal Curve

The Correlation Coefficient

Linear Regression

Using Probability to Make Decisions About Data

Introduction to Hypothesis Testing

Performing the One-Sample T-Test and Testing Correlation Coefficients

The One-Way Analysis of Variance

The Two-Way Analysis of Variance

Chi Square and Other Nonparametric Procedures

Filters

There are two ways in which samples can be related.In a _ design,each participant in one condition is paired with a participant in the other condition.In a _ design,each participant is tested under both conditions of the independent variable.

N represents _,whereas n represents _.