For Exercises 37–48, use the hypotheses and data from the indicated exercises to perform the test for by doing the following steps:

  1. State the hypotheses.
  2. Find and state the rejection rule.
  3. State the value of from the indicated exercise.
  4. State the conclusion and the interpretation.

Question 9.78

43. Use from Exercise 15 and from Exercise 29.

9.2.43

(a) (b) . Reject if . (c) (d) is . Therefore we reject . There is evidence at level of significance that the population mean is less than 20.