For each of the following​ situations, find the critical​ value(s) for z or t. ​ a) H0​: p=0.8 HA​: p≠0.8 at α=0.05 ​ b) H0​: p=0.5 HA​: p>0.5 at α=0.10 ​ C) H0​: μ=40 HA​: μ≠40 at α=0.10​; n=49

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