Question: A researcher is evaluating the influence of a treatment using a sample selected from a normally distributed population with a mean of u=80 and a standard deviation of o=20. The researcher expects a 12-point treatment effect and plans to use a two-tailed hypothesis test with o=.05.

a. Compute the power of the test if the researcher uses a sample of n=16 individuals.

b. Compute the power of the test if the researcher uses a sample of n=25 individuals.