All of the following increase the statistical power of a study EXCEPT:

• A Increasing the sample size
• B Increasing the effect size
• C Increasing the beta level ✓
• D Increasing the alpha level

Explanation

Power equals 1 minus beta. Increasing beta directly reduces power, so it does not increase power. Larger sample sizes reduce standard error and increase power. Larger true effect sizes are easier to detect. Raising alpha from 0.05 to 0.10 widens the rejection region, increasing power at the cost of more Type I errors.

Reference: Park's Textbook of Preventive and Social Medicine, 26th ed.

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