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You are concerned that age might increase the variance in the groups of your between-subjects design. How can you deal with this issue without reducing

You are concerned that age might increase the variance in the groups of your between-subjects design. How can you deal with this issue without reducing the external validity of the study? a. Hold age constant. b. add another level to your independent variable. c. Reduce sample size. d. Constrict the range of ages. e. Use age as an additional factor

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