We found a research paper: Victor RG etal, A Cluster-Randomized Trial of Blood-Pressure Reduction in Black Barbershop N Engl J Med 2018;378:1291-301. In the above study, “the initial design yielded 90% power to detect a 6.9 mm Hg greater reduction in systolic blood pressure at 6 months in the intervention group than in the control group.” What is the probability of type II error?
Group of answer choices
There is no enough information to determine Type II error.
6.9%
5%
10%