A study has a power level of .75. What does that mean? (Select all that apply.)
a. Study interventions will be statistically significant 75% of the time.
b. The study has a 75% chance of detecting differences if they exist.
c. The study's sample has a 25% attrition rate, at worst.
d. There is a 25% chance of detecting a type I error.
e. There is a 25% chance that the study will fail to reveal differences that actually exist.
ANS: B, E
Power is the capacity of the study to detect differences or relationships that actually exist in the population. Expressed another way, power is the capacity to correctly reject a null hypothesis. The minimum acceptable power for a study is commonly recommended to be 0.80 (80%). However, the researcher can set this lower, if the researcher is willing to risk a larger likelihood of a type II error.
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