1 Exampromax - Stuvia US 2025/2026
PSY 301 Lecture 8 Questions with Detailed
Verified Answers (100% Correct Answers)
/Already Graded A+
Between-Subjects Designs
Ans: • Each individual in a study is exposed to only one level of the IV
• Comparison of experimental groups = contrast between 2+ levels/groups
• Different group of participants are assigned
to each condition
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Advantages to a Between-Subjects Design
Exampromax - Stuvia US
Ans: + No contamination of behavior at other
levels of IV
+ Useful with research that involves
deception
+ Each participant enters the study "fresh"
+ Can be used with participant variables
+ Less time commitment for participants
Disadvantages to a Between-Subjects Design
Ans: - Large numbers of participants are needed
- More experimental time is required
- Can be costly if paying participants
- **Potential for nonequivalent groups**
Solution for Nonequivalent Groups
, 2 Exampromax - Stuvia US 2025/2026
Ans: • Try to create equivalent groups: groups
that are equal to each other in all important
ways except for the levels of the IV
• Equivalent groups are achieved through:
- Random assignment
- Matching
Matching
Ans: • Creates equivalent groups
• Participants are measured on a matching variable that is a known
© 2025 All rights reserved®
confound
• Groups are formed by taking participants who score the same on the
Exampromax - Stuvia US
matching variable and randomly assigning them to groups
• Useful when you:
- Have few participants
- Know what the confound may be
Within-Subject Design
Ans: • Each individual in a study is exposed to all
levels of the IV
• Comparison of the experimental groups
exists within each individual
• Same group of participants are assigned to
each condition
Advantages to Within-Subjects Designs
PSY 301 Lecture 8 Questions with Detailed
Verified Answers (100% Correct Answers)
/Already Graded A+
Between-Subjects Designs
Ans: • Each individual in a study is exposed to only one level of the IV
• Comparison of experimental groups = contrast between 2+ levels/groups
• Different group of participants are assigned
to each condition
© 2025 All rights reserved®
Advantages to a Between-Subjects Design
Exampromax - Stuvia US
Ans: + No contamination of behavior at other
levels of IV
+ Useful with research that involves
deception
+ Each participant enters the study "fresh"
+ Can be used with participant variables
+ Less time commitment for participants
Disadvantages to a Between-Subjects Design
Ans: - Large numbers of participants are needed
- More experimental time is required
- Can be costly if paying participants
- **Potential for nonequivalent groups**
Solution for Nonequivalent Groups
, 2 Exampromax - Stuvia US 2025/2026
Ans: • Try to create equivalent groups: groups
that are equal to each other in all important
ways except for the levels of the IV
• Equivalent groups are achieved through:
- Random assignment
- Matching
Matching
Ans: • Creates equivalent groups
• Participants are measured on a matching variable that is a known
© 2025 All rights reserved®
confound
• Groups are formed by taking participants who score the same on the
Exampromax - Stuvia US
matching variable and randomly assigning them to groups
• Useful when you:
- Have few participants
- Know what the confound may be
Within-Subject Design
Ans: • Each individual in a study is exposed to all
levels of the IV
• Comparison of the experimental groups
exists within each individual
• Same group of participants are assigned to
each condition
Advantages to Within-Subjects Designs
