For Exercises 29 and 30, assume normality of the data, and do the following:

  1. State the hypotheses.
  2. Find the critical value or values, and state the rejection rule.
  3. Find . Also, draw a distribution and indicate and the critical value or values.
  4. State the conclusion and the interpretation.

Question 9.414

29. We are testing whether and have a random sample of size 20 with a standard deviation of . Let .

9.99.29

(a) (b) . Reject if . (c)

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(d) Since , we reject . There is evidence that the population standard deviation is greater than 6.