APFIVE Addressing Variability in Experimental Design
A researcher is designing an experiment to test the effect of sleep duration on cognitive performance. The nature of the experimental units (human participants) presents a challenge because individuals vary greatly in baseline cognitive abilities. Which experimental design modification would BEST address this challenge while maintaining statistical validity?
A
Increase the sample size in a completely randomized design
B
Exclude participants with extreme baseline cognitive scores
C
Apply multiple treatments simultaneously to each participant
D
Use participants as their own controls in a repeated measures design
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