Computer skills again. The health care analyst in Exercise 18 finds a 90% confidence interval for the true proportion of employees who fail the course to be

(14.46%, 15.74%).

a) Explain why she can reject the null hypothesis that p = 0.159 vs. p 6 0.159 at a = 0.05.

b) Explain why the difference may or may not be important.

c) Could you reject the hypothesis that p = 0.157? Explain.