For Exercises 3–14, do the following:

  1. State the hypotheses.
  2. Calculate the critical value and state the rejection rule. Also, sketch the critical region.
  3. Find the test statistic .
  4. State the conclusion and the interpretation.

Question 9.199

3. vs. , , , ,

9.4.3

(a) (b) . Reject if .

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(c) (d) Since is , the conclusion is reject . There is evidence at the 0.05 level of significance that the population mean is less than 22.