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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