For Exercises 17–20, perform the large-sample sign test for the population median. Use the following steps:

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

Question 14.26

18. vs. , . There are 20 pluses and 180 minuses.