For Exercises 31–36, confidence interval is given. Use the confidence interval to test, using level of significance , whether differs from each of the indicated hypothesized values.

Question 9.229

33. A 90% confidence interval for is (−20, −10).

Hypothesized values are

  1. −21
  2. −5
  3. −12

9.4.33

Value of
 Form of hypothesis test,
with 		Where lies
in relation to
90% confidence
interval
(–20, −10)		 Conclusion of hypothesis test
(a) –21 Outside Reject
(b) –5 Outside Reject
(c) –12 Inside Do not reject