One way to increase power is to minimize the variability of the raw scores.How might this be accomplished?

Question

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Minimizing the variability of the raw scores can be accomplished by designing and conducting the experiment so that all the subjects in a sample are treated in a consistent manner. This will reduce the amount of random error in the data and increase the power of the test. Changing the significance level (A) or sample size (B) may have an impact on power, but they are not directly related to reducing the variability of the raw scores. Selecting two very different levels of the independent variable (D) may increase power, but this strategy is more focused on maximizing the effect size than minimizing variability.

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