For each of the following situations, find the critical value(s) for z or t.
a) H0: p = 0.2 vs. HA: p ≠ 0.2 at α = 0.01
b) H0: p = 0.3 vs. HA: p > 0.3 at α = 0.05
c) H0: μ = 40 vs. HA: μ ≠ 40 at α = 0.05; n = 33
d) H0: p = 0.2 vs. HA: p > 0.2 at α = 0.10; n = 345
e) H0: μ = 80 vs. HA: μ < 80 at α = 0.05; n = 1000
a) The critical value(s) is(are) z* = 2.58, -2.58.
(Use a comma to separate answers as needed. Round to two decimal places as needed.)
b) The critical value(s) is(are) z* =
(Use a comma to separate answers as needed. Round to two decimal places as needed.)