Calculate the z-value given the following: hypothesis test on population mean; x̅= 63; μ = 57; σ = 2; n = 45.

Calculate the t-value given the following: hypothesis test on population mean; x̅= 33; μ = 35; s = 5; n = 25.

If H_0: μ=5.2; H_1: μ > 5.2; α = 0.05; z = 2.222, then the null hypothesis ________.

If the critical value falls in the rejection region, then the null hypothesis ______.