For each of the following hypothesis tests in Exercises 10–12, do the following:

  1. Find the value of .
  2. Find the critical-value rejection rule.
  3. Draw a standard normal curve and indicate the critical region.
  4. State the conclusion and interpretation.

Question 9.396

11.

9.99.11

(a) 1.28 (b) Reject if .

(c)

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