Please answer all parts of this question

For each of the following situations, find the critical value(s) for z or t. a) Ho: p = 0.2 vs. HA: p # 0.2 at a = 0.05 b) Ho: p= 0.8 vs. HA: p > 0.8 at a = 0.01 c) Ho: H = 40 vs. HA: H # 40 at a = 0.01; n = 48 d) Ho: p= 0.2 vs. HA: p > 0.2 at a = 0.05; n = 335 e) Ho: H = 80 vs. HA: H