Good day! Could you please help me find the rejection region for each given the hypothesis, n, and significance level. My answers are 2.326, 1.645, and 2.326 for questions 1, 3, and 5 respectively: however, I am not sure if my answers are correct. Also, if the null hypothesis and the alternative hypothesis are the same, may I also ask as to whether the given is one-tailed or two-tailed? Thank you in advance!

1. He: = 121, H,: > 121 = 0.01 , n =39, = known 2. H.: = 98.6, H.: 98.6 = 0.05 , n = 25, = unknown 3. Ho: = 27 , H.: 2.9 = 0.01 , n =50, = known