A researcher is evaluating the influence of a treatment using a sample selected from a normally distributed population with a mean of m = 40 and a standard deviation of s = 12. The researcher expects...

A researcher is evaluating the influence of a treatment using a sample selected from a normally distributed population with a mean of m = 40 and a standard deviation of s = 12. The researcher expects a 6-point treatment effect and plans to use a two-tailed hypothesis test with a = .05.

a. Compute the power of the test if the researcher uses a sample of n = 9 individuals

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