Choosing A Design

1. To maximize the chances of finding a statistically significant effect for an independent variable, would it be better for the variable to be within-subjects or between-subjects?

   Why?

2. To maximize the internal validity of your findings about the effect for an independent variable, would it be better for the variable to be within-subjects or between-subjects?

   Why?

For each independent variable listed below, determine whether it would be best for that variable to be a between-subjects variable or a within-subjects variable. Explain your choice.

Independent Variable	Between or Within?	Explanation/Reason for your choice
Surgery (No Surgery/Surgery)	xxx	xxx
Trials (Trial 1 vs. Trial 2)	xxx	xxx
Color of Exams (Blue/Red)	xxx	xxx
Difficulty of Question (Easy/Difficult)	xxx	xxx

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