For Exercises 15–26, do the following:

  1. State the hypotheses and the rejection rule using the -value method.
  2. Calculate the test statistic .
  3. Find the -value. (Use technology or estimate the -value.)
  4. State the conclusion and the interpretation.

Question 9.217

21. vs. , , , ,

9.4.21

(a) . Reject if the (b) (c) 1 (d) Since the is not , the conclusion is do not reject . There is insufficient evidence at the 0.01 level of significance that the population mean differs from 25.