Determine the critical values that would be used in testing each of the following null hypotheses using the classical approach.

a. Ho:   0 vs. Ha:   0, with n  18 and

  0.05

b. Ho:   0 vs. Ha:   0, with n  32 and

  0.01

c. Ho:   0 vs. Ha:   0, with n  16 and

  0.05