For Exercises 27–32, assume that the populations are normally distributed. Perform the indicated hypothesis tests using the -value method. For each exercise,

  1. State the hypotheses and the rejection rule.
  2. Find .
  3. Find the -value.
  4. State the conclusion and interpretation.

Question 10.187

31.

10.4.31

(a) . Reject if the .

(b) (c) . (d) Since the is not , we do not reject . There is insufficient evidence at the level of significance that the population standard deviation of Population 1 is different from the population standard deviation of Population 2.