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Increasing Statistical Power
If a research design lacks adequate statistical power, researchers can increase it by either increasing the sample size or strengthening the relationship. Strengthening the relationship can be achieved by using a stronger experimental manipulation or by carefully controlling extraneous variables to reduce data noise, such as employing a within-subjects design instead of a between-subjects design. However, the most common and practical strategy to boost power is simply to increase the sample size.
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Research Methods in Psychology - 4th American Edition @ KPU
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Example of Sample Size Requirements for High Statistical Power
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Which of the following best defines the statistical power of a research design?
A researcher designs a study with a statistical power of .80. This means there is a 20% probability that the study will fail to detect a real effect that actually exists in the population.