A recent study by Allstate Insurance Co. finds that 82% of teenagers have used cell phones while driving (The Wall Street Journal, May 5 , 2010). In October 2010, Massachusetts enacted a law that forbids cell phone use by drivers under the age o f 18. A policy analyst w ould like to determ ine w hether the law has decreased the proportion o f drivers under the age o f 18 w ho use a cell phone.

a. State the null and the alternative hypotheses to test the policy analyst's objective.

b. Suppose a sample of 200 drivers under the age of 18 results in 150 who still use a cell phone while driving.

What is the value of the test statistic? What is the p-value?

c. At α = 0.05 has the law been effective?

d. Repeat this exercise using the critical value approach with α = 0.05. P-56