Determine the critical value(s) and regions that would be used in testing each of the following null hypotheses using the classical approach:

a. Ho:

1  0 vs. Ha:

1  0, with n  18 and

  0.05

b. Ho:

1  0 vs. Ha:

1  0, with n  28 and

  0.01

c. Ho:

1  0 vs. Ha:

1  0, with n  16 and

  0.05