Determine the critical region and critical values for z that would be used to test the null hypothesis at the given level of significance, as described in each of the following:
(A) Ho:μ = 10 and ,Ha:μ ≠ 10 α = 0.05
(B) Ho:μ ≤ 12 and ,Ha:μ ?12 α = 0.10
(C) Ho:μ ≥ 18 and , Ha:μ ?18 α = 0.01