Question 1

In a between-subjects design,to compare proportions between groups,an independent-measures t test is appropriate.​

Accepted Answer

A) True 
 B)False

Question 2

Holding a variable constant prevents a participant characteristic from becoming a confound by ____.

Accepted Answer

A)  ​eliminating variability in that characteristic
B)  ​reducing error
C)  ensuring a nonbiased sample
D)  ​increasing the differences between the groups

Question 3

Randomizing a variable across treatments guarantees that the variable cannot become a confounding variable.​

Accepted Answer

A) True 
 B)False

Question 4

Why is random assignment used in between-subjects experimental designs?​

Accepted Answer

A)  ​to hold participant characteristics constant
B)  ​to ensure a nonbiased sample
C)  to ensure anonymity of the research participants
D)  ​to eliminate systematic differences between the groups

Question 5

In a between-subjects design,the separate groups must be as ____.​

Accepted Answer

A)  ​similar in participant characteristics as possible
B)  ​different in all environmental variables as possible
C)  similar in treatment conditions as possible
D)  ​similar on the dependent variable measures as possible.

Question 6

In an experiment examining the effects of size of plate on amount of food eaten,one group of participants is measured after eating food on 12-inch plates.Another group of participants is measured after eating food on 10-inch plates.This is an example of a ____ design.​

Accepted Answer

A)  ​single-subjects
B)  ​between-subjects
C)  within-subjects
D)  ​matched groups

Question 7

In a between-subjects design,holding constant a participant characteristic,such as age or gender,is one way to ____.

Accepted Answer

A)  ​reduce the variance within treatments
B)  ​maximize the variance within treatments
C)  ​increase individual differences.
D)  ​increase sample size

Question 8

Compared to within-subjects designs,between-subjects designs require relatively ____.

Accepted Answer

A)  ​larger numbers of participants
B)  ​smaller numbers of participants
C)  less control of individual difference
D)  ​more concern for practice effects

Question 9

The primary limitation of a two-group design is that it ____.

Accepted Answer

A)  ​is extremely difficult to interpret
B)  ​decreases the chances of demonstrating a significant mean difference
C)  tends to reduce the differences between the groups
D)  ​may not provide a complete picture of the relationship between the variables

Question 10

An advantage of between-subjects designs is that they require fewer participants than are typically needed for within-subjects designs.​

Accepted Answer

A) True 
 B)False

Question 11

Assignment bias can threaten the internal validity of between-subjects experiments.​

Accepted Answer

A) True 
 B)False

Question 12

Increasing variance within groups ____ the likelihood of finding a difference between the treatment conditions.

Accepted Answer

A)  ​increases
B)  ​decreases
C)  does not affect
D)  ​increase, then decreases

Question 13

When comparing means in a single-factor multiple group design,which statistical analysis is most appropriate?

Accepted Answer

A)  ​independent-measures t test
B)  ​repeated-measures t test 
C)  single-factor analysis of variance
D)  ​chi-square test for independence

Question 14

In a between-subjects experiment,when the process of assigning participants to the treatment conditions produces groups with different characteristics,the ____of the study is threatened.​

Accepted Answer

A)  ​internal validity
B)  ​external validity
C)  reliability
D)  ​accuracy

Question 15

An experiment that uses a different group of participants for each treatment condition is called a ____ design.​

Accepted Answer

A)  ​single-subjects
B)  ​between-subjects
C)  within-subject
D)  ​matched groups

Question 16

Validity is threatened in a between-subjects design when participants in one group have an opportunity to talk with participants in the other.

Accepted Answer

A) True 
 B)False

Question 17

A limitation of a single-factor multiple group design is that the ____.

Accepted Answer

A)  ​mean differences between the groups become smaller as more groups are used
B)  ​interpretation is too simplistic
C)  chances of demonstrating a significant mean difference are increased
D)  ​complete picture of the relationship between the variables cannot be seen

Question 18

Explain the benefit of independent scores in a between-subjects design.​

Accepted Answer

​In a between-subjects design,each parti...

Question 19

In a between-subjects experiment,if the participants in one group are noticeably older than the participants in another group,then participant age is a confounding variable and threatens the internal validity of the experiment.​

Accepted Answer

A) True 
 B)False

Question 20

Differential attrition refers to ____.

Accepted Answer

A)  ​differences in one group of participants from another group
B)  ​differences in the number of withdrawals among experimental groups
C)  the spreading of treatment effects from the experimental to the control group
D)  ​the demands of the untreated group to receive equal treatment

Exam 8: Experimental Designs: Between Subjects Design.

When comparing means in a single-factor multiple group design,which statistical analysis is most appropriate?

Correct AnswerverifiedShow Answer

In a between-subjects experiment,if the participants in one group are noticeably older than the participants in another group,then participant age is a confounding variable and threatens the internal validity of the experiment.​

Correct AnswerverifiedShow Answer

In a between-subjects design,to compare proportions between groups,an independent-measures t test is appropriate.​

Correct AnswerverifiedShow Answer

In an experiment examining the effects of size of plate on amount of food eaten,one group of participants is measured after eating food on 12-inch plates.Another group of participants is measured after eating food on 10-inch plates.This is an example of a ____ design.​

Correct AnswerverifiedShow Answer

In a between-subjects experiment,when the process of assigning participants to the treatment conditions produces groups with different characteristics,the ____of the study is threatened.​

Correct AnswerverifiedShow Answer

An advantage of between-subjects designs is that they require fewer participants than are typically needed for within-subjects designs.​

Correct AnswerverifiedShow Answer

Compared to within-subjects designs,between-subjects designs require relatively ____.

Correct AnswerverifiedShow Answer

Assignment bias can threaten the internal validity of between-subjects experiments.​

Correct AnswerverifiedShow Answer

An experiment that uses a different group of participants for each treatment condition is called a ____ design.​

Correct AnswerverifiedShow Answer

The primary limitation of a two-group design is that it ____.

Correct AnswerverifiedShow Answer

A limitation of a single-factor multiple group design is that the ____.

Correct AnswerverifiedShow Answer

Increasing variance within groups ____ the likelihood of finding a difference between the treatment conditions.

Correct AnswerverifiedShow Answer

Holding a variable constant prevents a participant characteristic from becoming a confound by ____.

Correct AnswerverifiedShow Answer

In a between-subjects design,the separate groups must be as ____.​

Correct AnswerverifiedShow Answer

Validity is threatened in a between-subjects design when participants in one group have an opportunity to talk with participants in the other.

Correct AnswerverifiedShow Answer

Explain the benefit of independent scores in a between-subjects design.​

Correct Answerverified​In a between-subjects design,each parti...View AnswerShow Answer

Differential attrition refers to ____.

Correct AnswerverifiedShow Answer

Randomizing a variable across treatments guarantees that the variable cannot become a confounding variable.​

Correct AnswerverifiedShow Answer

In a between-subjects design,holding constant a participant characteristic,such as age or gender,is one way to ____.

Correct AnswerverifiedShow Answer

Why is random assignment used in between-subjects experimental designs?​

Correct AnswerverifiedShow Answer

Correct Answer
verified

In a between-subjects experiment,if the participants in one group are noticeably older than the participants in another group,then participant age is a confounding variable and threatens the internal validity of the experiment.

Correct Answer
verified

In a between-subjects design,to compare proportions between groups,an independent-measures t test is appropriate.

Correct Answer
verified

In an experiment examining the effects of size of plate on amount of food eaten,one group of participants is measured after eating food on 12-inch plates.Another group of participants is measured after eating food on 10-inch plates.This is an example of a ____ design.

Correct Answer
verified

In a between-subjects experiment,when the process of assigning participants to the treatment conditions produces groups with different characteristics,the ____of the study is threatened.

Correct Answer
verified

An advantage of between-subjects designs is that they require fewer participants than are typically needed for within-subjects designs.

Correct Answer
verified

Correct Answer
verified

Assignment bias can threaten the internal validity of between-subjects experiments.

Correct Answer
verified

An experiment that uses a different group of participants for each treatment condition is called a ____ design.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

In a between-subjects design,the separate groups must be as ____.

Correct Answer
verified

Correct Answer
verified

Explain the benefit of independent scores in a between-subjects design.

Correct Answer
verified
In a between-subjects design,each parti...
View Answer

Correct Answer
verified

Randomizing a variable across treatments guarantees that the variable cannot become a confounding variable.

Correct Answer
verified

Correct Answer
verified

Why is random assignment used in between-subjects experimental designs?

Correct Answer
verified