Based on a study conducted last year, the incidence of heavy drinking among teenagers was 15%. You are in charge of monitoring this rate and conducted the annual survey. Of the 234 teenagers in the survey, 40 of them were heavy drinkers. If you want to know if the incidence rate has changed.
a. What are the null and alternate hypotheses?
b. What is the test statistic to be used?
c. Using a 5% significance level, can we conclude that the incidence rate has changed