This is exactly how the question is presented. \" Statistical power is an import

Question

This is exactly how the question is presented.

"Statistical power is an important determination when planning a research study. The higher the power, the higher the chance the study will produce a statistically significant result if if Ho is rejected. A widely used rule is that study should have 80% power to be worth doing" (J. Cohen, 1988: Statistical power analysis for the behavioral sciences, 2nd ed. Hillsdale, NJ: Erlbaum).

Which one of the following changes made to a study plan will increase its statistical power?

1. Changing the study's definition so that the predicted difference between population means decreases

2. Decrease sample size

3. Increase population standard deviation

4. Increase effect size

How do you support the answer you choose?

Explanation / Answer

The answer is 4. Increase the effect size because the statistical power is affected chiefly by the size of the effect . Bigger effects are easier to detect than smaller effects.

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