Question 1

What are some of the threats to internal validity that exist in this study? (see Chapter 8 in your textbook).

Accepted Answer

(1) History: perhaps an event occurred b

Question 2

Understanding Experiments with Two Groups - Answer Key
Twenty sets of depressed twins are obtained for a study on the effects of a new antidepressant. In each twin set, one twin is assigned to receive the drug, and the other is designed to receive the placebo. Three months later, depression levels are measured on a scale from 1 (not at all depressed) to 7 (very depressed). The following data was obtained:
 GROUP $1 =$ Received drug
GROUP $2 =$ Received placebo
Variable $=$ Depression level
$\begin{array} { l l l l } \text { GROUP } & N & \text { Mean } & S D \ \text { GROUP 1 } & 10 & 3.21 & 1.035 \ \text { GROUP 2 } & 10 & 5.77 & 1.772 \ t = 5.785 & d f = 9 & p = 0.017 & \text { Cohen's } d = .88 \end{array}$
-What is the scale of measurement for the dependent variable?

Accepted Answer

The answer of Understanding Experiments with Two Groups - Answer...

Question 3

When we randomly assign our participants to groups, we create

Accepted Answer

A)  independent groups. 
B)  matched pairs. 
C)  natural pairs. 
D)  All of the above. 
A)  independent groups. 
B)  matched pairs. 
C)  natural pairs. 
D)  All of the above.

Question 4

With ________ assignment, we equate groups on a specific variable, and with _______ assignment, we leave the equating process to chance.

Accepted Answer

A)  matched; random 
B)  statistical; matched 
C)  random; matched 
D)  matched; statistical 
A)  matched; random 
B)  statistical; matched 
C)  random; matched 
D)  matched; statistical

Question 5

Explain why the simplest type of experiment consists of one independent variable with two groups.

Accepted Answer

The simplest type of experiment consists

Question 6

When we compare groups of participants who were assigned to groups through matched pairs, natural pairs, or repeated measures, we are using a

Accepted Answer

A)  between-subjects comparison. 
B)  random assignment comparison. 
C)  within-subjects comparison. 
D)  control-subjects comparison. 
A)  between-subjects comparison. 
B)  random assignment comparison. 
C)  within-subjects comparison. 
D)  control-subjects comparison.

Question 7

A researcher ________ manipulate an independent variable in ex post facto research; therefore, we ______ draw cause-and-effect conclusions.

Accepted Answer

A)  does; can 
B)  does not; can 
C)  does; cannot 
D)  does not; cannot 
A)  does; can 
B)  does not; can 
C)  does; cannot 
D)  does not; cannot

Question 8

Which of the following is a similarity between the two independent-groups design and the two correlated-groups design?

Accepted Answer

A)  Both designs involve two independent variables. 
B)  Both designs involve the same kind of assignment to groups. 
C)  Both designs involve one independent variable with two groups. 
D)  Both designs involve a correlational design rather than an experimental design. 
A)  Both designs involve two independent variables. 
B)  Both designs involve the same kind of assignment to groups. 
C)  Both designs involve one independent variable with two groups. 
D)  Both designs involve a correlational design rather than an experimental design.

Question 9

Explain this sentence: "Generally speaking, t tests are robust with regard to the assumption of homogeneity" (Smith & Davis, 2010, p. 222).

Accepted Answer

The sentence "Generally speaking, t test

Question 10

When is the best time to choose your statistical analysis?

Accepted Answer

A)  before data collection 
B)  during data collection 
C)  after data collection 
D)  it doesn't matter 
A)  before data collection 
B)  during data collection 
C)  after data collection 
D)  it doesn't matter

What are some of the threats to internal validity that exist in this study? (see Chapter 8 in your textbook).

When we randomly assign our participants to groups, we create

With __ assignment, we equate groups on a specific variable, and with _ assignment, we leave the equating process to chance.

Explain why the simplest type of experiment consists of one independent variable with two groups.

When we compare groups of participants who were assigned to groups through matched pairs, natural pairs, or repeated measures, we are using a

A researcher __ manipulate an independent variable in ex post facto research; therefore, we draw cause-and-effect conclusions.

Which of the following is a similarity between the two independent-groups design and the two correlated-groups design?

Explain this sentence: "Generally speaking, t tests are robust with regard to the assumption of homogeneity" (Smith & Davis, 2010, p. 222).

When is the best time to choose your statistical analysis?

Psychological Research and the Research Methods Course

Developing a Good Research Idea and Conducting an Ethical Project

Qualitative Research Methods

Nonexperimental Methods: Descriptive Methods, Correlational Studies, Ex Post Facto Studies, Surveys and Questionnaires, Sampling, and Basic Research Strategies

Using the Scientific Method in Psychology

Conducting a Good Experiment I: Variables and Control

Conducting a Good Experiment Ii: Final Considerations, Unanticipated Influences, and Cross-Cultural Issues

Internal and External Validity

Using Statistics to Answer Questions

Designing, Conducting, Analyzing, and Interpreting Experiments With More Than Two Groups

Designing, Conducting, Analyzing, and Interpreting Experiments With Multiple Independent Variables

Alternative Research Designs

Writing and Assembling an Apa-Format Research Report

Filters

Exam 10: Designing, Conducting, Analyzing, and Interpreting Experiments With Two Groups

What are some of the threats to internal validity that exist in this study? (see Chapter 8 in your textbook).

When we randomly assign our participants to groups, we create

With ________ assignment, we equate groups on a specific variable, and with _______ assignment, we leave the equating process to chance.

Explain why the simplest type of experiment consists of one independent variable with two groups.

When we compare groups of participants who were assigned to groups through matched pairs, natural pairs, or repeated measures, we are using a

A researcher ________ manipulate an independent variable in ex post facto research; therefore, we ______ draw cause-and-effect conclusions.

Which of the following is a similarity between the two independent-groups design and the two correlated-groups design?

Explain this sentence: "Generally speaking, t tests are robust with regard to the assumption of homogeneity" (Smith & Davis, 2010, p. 222).

When is the best time to choose your statistical analysis?

Psychological Research and the Research Methods Course

Developing a Good Research Idea and Conducting an Ethical Project

Qualitative Research Methods

Nonexperimental Methods: Descriptive Methods, Correlational Studies, Ex Post Facto Studies, Surveys and Questionnaires, Sampling, and Basic Research Strategies

Using the Scientific Method in Psychology

Conducting a Good Experiment I: Variables and Control

Conducting a Good Experiment Ii: Final Considerations, Unanticipated Influences, and Cross-Cultural Issues

Internal and External Validity

Using Statistics to Answer Questions

Designing, Conducting, Analyzing, and Interpreting Experiments With More Than Two Groups

Designing, Conducting, Analyzing, and Interpreting Experiments With Multiple Independent Variables

Alternative Research Designs

Writing and Assembling an Apa-Format Research Report

Filters

With __ assignment, we equate groups on a specific variable, and with _ assignment, we leave the equating process to chance.

A researcher __ manipulate an independent variable in ex post facto research; therefore, we draw cause-and-effect conclusions.