Addressing Variability in Experimental Design
A researcher is designing an experiment to investigate the effect of sleep duration on cognitive performance. The participants are human subjects, and their baseline cognitive abilities vary greatly. Which modification to the experimental design would best account for this source of variability?
A
Increase the sample size in a completely randomized design
B
Apply multiple treatments simultaneously to each participant
C
Use participants as their own controls in a repeated measures design
D
Exclude participants with extreme baseline cognitive scores
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