For Exercises 14 and 15, perform the following steps:

  1. State the hypotheses and the rejection rule for the -value method.
  2. Calculate .
  3. Find the -value. Draw the standard normal curve, with and the -value indicated on it.
  4. State the conclusion and the interpretation.

Question 9.399

14. We are interested in testing at level of significance whether the population mean differs from 500. A random sample of size 100 is taken, with a mean of 520. Assume .