Power analysis is used to determine the required sample size by considering the statistical power and the expected effect size. Which of the following statements is true?

Power analysis is used to determine the required sample size by considering the statistical power and the expected effect size. Which of the following statements is true?

• A. It determines the required sample size to detect a specified effect with a chosen power level.
• B. It predicts the exact population effect size.
• C. It eliminates measurement error entirely.
• D. It guarantees a statistically significant result.

Answer: (A)