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Biostatistics & Research · single question

What is most directly related to the statistical power of a study?

  1. Type I error
  2. Type II error
  3. Type I error / 2
  4. Type II error / 2
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Correct answer: B. Type II error

Statistical power is mathematically defined as 1 minus the Type II error rate (power = 1 − β). Of the choices given, Type II error is the term that power is directly and inversely related to (as Type II error decreases, power increases) — Type I error (α) relates instead to the threshold for statistical significance, not power.

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