Question 1

Following a significant t-test,Clarinda wants to calculate her Cohen's d value.She has   and   .Calculate the correct Cohen's d value.

Accepted Answer

A) d = 4.00 
B) d = 0.707 
C) d = 0.25 
D) d = 0.50 
A) d = 4.00 
B) d = 0.707 
C) d = 0.25 
D) d = 0.50

Question 2

If   ,and   ,what is   when   and   ?

Accepted Answer

A) 0.63 
B) 2.00 
C) 3.16 
D) Cannot be calculated from this information. 
A) 0.63 
B) 2.00 
C) 3.16 
D) Cannot be calculated from this information.

Question 3

In a related-samples design,   states that

Accepted Answer

A) our population mean represents the distribution of difference scores wherein   . 
B) our population mean represents a sample of difference scores where   . 
C) our sample mean represents a population of difference scores for which   . 
D) our sample mean represents a population of difference scores for which   . 
A) our population mean represents the distribution of difference scores wherein   . 
B) our population mean represents a sample of difference scores where   . 
C) our sample mean represents a population of difference scores for which   . 
D) our sample mean represents a population of difference scores for which   .

Question 4

One way to increase power is to minimize the variability of the raw scores.How might this be accomplished?

Accepted Answer

A) Change F1F1F1S1F1F1F10 from 0.05 to 0.01. 
B) Change the size of N from 100 to 25. 
C) Design and conduct the experiment so that all the subjects in a sample are treated in a consistent manner. 
D) Select two very different levels of the independent variable that are likely to produce a relatively large difference between the means. 
A) Change F1F1F1S1F1F1F10 from 0.05 to 0.01. 
B) Change the size of N from 100 to 25. 
C) Design and conduct the experiment so that all the subjects in a sample are treated in a consistent manner. 
D) Select two very different levels of the independent variable that are likely to produce a relatively large difference between the means.

Question 5

A related-samples t-test has resulted in a   and   .If the appropriate two-tailed   ,construct a 95% confidence interval.

Accepted Answer

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

Question 6

When we construct a 95% confidence interval,we are 95% sure that the

Accepted Answer

A) sample mean difference falls within the interval. 
B) population mean difference falls within the interval. 
C) population mean difference is at the center of the interval. 
D) sample mean difference is at the center of the interval. 
A) sample mean difference falls within the interval. 
B) population mean difference falls within the interval. 
C) population mean difference is at the center of the interval. 
D) sample mean difference is at the center of the interval.

Question 7

At a card players' club,the poker players had a contest with the blackjack players to see who could win the most money.The appropriate design for testing the significance of the difference between the means is

Accepted Answer

A) related samples t-test. 
B) independent samples t-test. 
C) one-sample t-test. 
D) z-test. 
A) related samples t-test. 
B) independent samples t-test. 
C) one-sample t-test. 
D) z-test.

Question 8

One way to increase power is to maximize the difference produced by the two conditions in the experiment.How might this be accomplished?

Accepted Answer

A) Change F1F1F1S1F1F1F10 from 0.05 to 0.01. 
B) Change the size of N from 100 to 25. 
C) Design and conduct the experiment so that all the subjects in a sample are treated in a consistent manner. 
D) Select two very different levels of the independent variable that are likely to produce a relatively large difference between the means. 
A) Change F1F1F1S1F1F1F10 from 0.05 to 0.01. 
B) Change the size of N from 100 to 25. 
C) Design and conduct the experiment so that all the subjects in a sample are treated in a consistent manner. 
D) Select two very different levels of the independent variable that are likely to produce a relatively large difference between the means.

Question 9

How is the null hypothesis of the independent samples t-test verbalized?

Accepted Answer

A) There is a relationship between the independent variable and the dependent variable. 
B) There is no relationship between the independent variable and the dependent variable. 
C) The difference between the sample means is equal to µ. 
D) The independent variable has an effect on the dependent variable. 
A) There is a relationship between the independent variable and the dependent variable. 
B) There is no relationship between the independent variable and the dependent variable. 
C) The difference between the sample means is equal to µ. 
D) The independent variable has an effect on the dependent variable.

Question 10

A researcher asked 26 extroverts and 36 introverts how happy they were.The results are shown in the graph below.The   = 2.96.Calculate the strength of the relationship using the squared Point-Biserial Correlation Coefficient.

Accepted Answer

A) F1F1F1S1F1F1F100.13 
B) +0.13 
C) F1F1F1S1F1F1F100.36 
D) +0.36 
A) F1F1F1S1F1F1F100.13 
B) +0.13 
C) F1F1F1S1F1F1F100.36 
D) +0.36

Question 11

On the basis of a pretest on knowledge of foreign languages,each subject in the 9:00 class was matched with a subject in the 10:30 class.The 9:00 class used a participant approach to the study of Latin,and the 10:30 class used the Hiffendorf method.At the end of the term,the same Latin test was given to both classes.The appropriate design for testing the significance of the difference between the means is

Accepted Answer

A) one-sample t-test. 
B) z-test. 
C) related-samples t-test. 
D) independent-samples t-test. 
A) one-sample t-test. 
B) z-test. 
C) related-samples t-test. 
D) independent-samples t-test.

Question 12

What should you conclude if two randomly selected sample means produce a confidence interval that is   ?

Accepted Answer

A) A math error was made in the computation of the interval. 
B) You are 95% confident that the interval between F1F1F1S1F1F1F101.51 and 2.62 contains the difference between the F1F1F1S1F1F1F10s for the two conditions. 
C) The sample means probably came from populations with   . 
D) You are 95% confident that the difference between the conditions is 2.0. 
A) A math error was made in the computation of the interval. 
B) You are 95% confident that the interval between F1F1F1S1F1F1F101.51 and 2.62 contains the difference between the F1F1F1S1F1F1F10s for the two conditions. 
C) The sample means probably came from populations with   . 
D) You are 95% confident that the difference between the conditions is 2.0.

Question 13

Using a line graph when interpreting the results of a two-sample experiment allows us to

Accepted Answer

A) envision the scatterplot that the data would form. 
B) determine the strength of the relationship. 
C) see whether there are significant differences between the samples. 
D) apply correlational statistics. 
A) envision the scatterplot that the data would form. 
B) determine the strength of the relationship. 
C) see whether there are significant differences between the samples. 
D) apply correlational statistics.

Question 14

In an experiment,the "proportion of variance accounted for" goes by another name.It is called the

Accepted Answer

A) effect size. 
B) error reduction coefficient. 
C) confidence interval. 
D) standard error of the difference between means. 
A) effect size. 
B) error reduction coefficient. 
C) confidence interval. 
D) standard error of the difference between means.

Question 15

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

Accepted Answer

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

Question 16

Daniel conducted an independent-samples t-test and found t(20)= 0.57,p > .05.He then calculated his effect size and obtained a value of d = 0.02.What should Daniel say in the report on his results?

Accepted Answer

A) He should indicate he has obtained a significant test result,with a small effect size. 
B) He should indicate his t-test is not significant,and that his effect size is a small one. 
C) He should indicate his t-test is not significant.He should,therefore,not report his effect size. 
D) He should recheck his calculations because a t-value of 0.57 is not possible. 
A) He should indicate he has obtained a significant test result,with a small effect size. 
B) He should indicate his t-test is not significant,and that his effect size is a small one. 
C) He should indicate his t-test is not significant.He should,therefore,not report his effect size. 
D) He should recheck his calculations because a t-value of 0.57 is not possible.

Question 17

We know that in an independent samples t-test we could state our null hypothesis as   .However,we usually state it as which of the following,instead?

Accepted Answer

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

Question 18

Renee is studying the effect of positive reinforcement for her psychology class.She randomly assigns 16 pigeons to two different positive reinforcement schedules.After training the pigeons,she measures the number of correct responses by each in 10 trials.Using a two-tailed test and   ,use the data below to determine whether or not there is a difference between the two schedules.

Accepted Answer

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

Question 19

For   ,and   ,use a   and compute a 95% confidence interval for   .

Accepted Answer

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

Question 20

Ten volunteers recorded their blood pressure in a room with an aquarium and then in a room without one.The appropriate design for testing the significance of the difference between the means is

Accepted Answer

A) related-samples t-test. 
B) independent-samples t-test. 
C) one-sample t-test. 
D) z-test. 
A) related-samples t-test. 
B) independent-samples t-test. 
C) one-sample t-test. 
D) z-test.

Following a significant t-test,Clarinda wants to calculate her Cohen's d value.She has and .Calculate the correct Cohen's d value.

If ,and ,what is when and ?

In a related-samples design, states that

One way to increase power is to minimize the variability of the raw scores.How might this be accomplished?

A related-samples t-test has resulted in a and .If the appropriate two-tailed ,construct a 95% confidence interval.

When we construct a 95% confidence interval,we are 95% sure that the

At a card players' club,the poker players had a contest with the blackjack players to see who could win the most money.The appropriate design for testing the significance of the difference between the means is

One way to increase power is to maximize the difference produced by the two conditions in the experiment.How might this be accomplished?

How is the null hypothesis of the independent samples t-test verbalized?

A researcher asked 26 extroverts and 36 introverts how happy they were.The results are shown in the graph below.The = 2.96.Calculate the strength of the relationship using the squared Point-Biserial Correlation Coefficient.

What should you conclude if two randomly selected sample means produce a confidence interval that is ?

Using a line graph when interpreting the results of a two-sample experiment allows us to

In an experiment,the "proportion of variance accounted for" goes by another name.It is called the

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

Daniel conducted an independent-samples t-test and found t(20)= 0.57,p > .05.He then calculated his effect size and obtained a value of d = 0.02.What should Daniel say in the report on his results?

We know that in an independent samples t-test we could state our null hypothesis as .However,we usually state it as which of the following,instead?

For ,and ,use a and compute a 95% confidence interval for .

Ten volunteers recorded their blood pressure in a room with an aquarium and then in a room without one.The appropriate design for testing the significance of the difference between the means is

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

Following a significant t-test,Clarinda wants to calculate her Cohen's d value.She has and .Calculate the correct Cohen's d value.

If ,and ,what is when and ?

In a related-samples design, states that

One way to increase power is to minimize the variability of the raw scores.How might this be accomplished?

A related-samples t-test has resulted in a and .If the appropriate two-tailed ,construct a 95% confidence interval.

When we construct a 95% confidence interval,we are 95% sure that the

At a card players' club,the poker players had a contest with the blackjack players to see who could win the most money.The appropriate design for testing the significance of the difference between the means is

One way to increase power is to maximize the difference produced by the two conditions in the experiment.How might this be accomplished?

How is the null hypothesis of the independent samples t-test verbalized?

A researcher asked 26 extroverts and 36 introverts how happy they were.The results are shown in the graph below.The = 2.96.Calculate the strength of the relationship using the squared Point-Biserial Correlation Coefficient.

What should you conclude if two randomly selected sample means produce a confidence interval that is ?

Using a line graph when interpreting the results of a two-sample experiment allows us to

In an experiment,the "proportion of variance accounted for" goes by another name.It is called the

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

Daniel conducted an independent-samples t-test and found t(20)= 0.57,p > .05.He then calculated his effect size and obtained a value of d = 0.02.What should Daniel say in the report on his results?

We know that in an independent samples t-test we could state our null hypothesis as .However,we usually state it as which of the following,instead?

For ,and ,use a and compute a 95% confidence interval for .

Ten volunteers recorded their blood pressure in a room with an aquarium and then in a room without one.The appropriate design for testing the significance of the difference between the means is

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