Consider a hypothesis test with H0 : μ = 70 and Ha : μ < 70. Which of the following choices of significance level and sample size results in the greatest power of the test when μ = 65?
(A)α = 0.05, n = 15 (B)α = 0.01, n = 15 (C)α = 0.05, n = 30 (D)α = 0.01, n = 30
C