Biostatistics & Research · single question
What is the correct formula for statistical POWER?
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Correct answer: A. 1 − Type II error (β)
- A. Statistical POWER = 1 − β, where β = Type II error rate (probability of a false negative — failing to detect a true effect). Power is the probability that the study will correctly detect a true effect when it exists. Typically, studies aim for power ≥ 0.80 (β ≤ 0.20).
- B. Type I error / 2 has no standard statistical definition.
- C. 1 − α = confidence level (not statistical power). Significance level α is the probability of a Type I error (false positive).
- D. Type II error / 2 has no standard statistical definition.
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