KEY TERMS

Dependent groups t test

Within-subjects designs (repeated measures designs)

Order effects

Practice effects

Fatigue effects

Carry-over effects

Sensitization

Counterbalanced design

Mixed designs

Key Issues

1. What are the advantages and limitations of the matched pairs design?

2. What are the advantages and limitations of the pure within-subjects design?

3. How are the advantages and limitations of the within- subjects design similar to the strengths and weaknesses of the matched pairs design? How are they different?

4. How can counterbalancing solve some of the weaknesses of the within-subjects design?

5. Other than counterbalancing, what strategies can be used to solve the problems that may plague within-subject designs?

6. What is a mixed design?

7. How should a researcher decide which of the following designs to use:
   1. traditional between subjects design

   2. pure within-subjects design

   3. counterbalanced design

   4. mixed design

   5. matched pairs design?

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