Power is controlled by
A) sample size.
B) variability.
C) true mean differences.
D) all of the above

Question

Quizplus · Accepted Answer

Power is affected by all three factors - sample size, variability, and true mean differences. A larger sample size increases power, as it reduces the standard error and increases the precision of the estimate. Lower variability (or smaller standard deviation) also increases power, as it reduces the amount of noise in the data. True mean differences refer to the effect size or the magnitude of the difference between the groups being compared, and larger differences increase power as they make it easier to detect a significant effect. Therefore, all three factors together contribute to the overall power of a statistical test.

Power Is Controlled by