115 A random sample of n observations is selected from a normal population to test the null hypothesis that s2 = 25.

Specify the rejection region for each of the following combinations of Ha,

a, and n :

a. Ha: s2  25; a = .05; n = 16

b. Ha: s2 7 25; a = .01; n = 23

c. Ha: s2 7 25; a = .10; n = 15

d. Ha: s2 6 25; a = .01; n = 13

e. Ha: s2  25; a = .10; n = 7

f. Ha: s2 6 25; a = .05; n = 25