Question

A study by Allstate Insurance Co. finds that 82% of teenagers have used cell phones while driving (The Wall StreetJournal May 5. 2010). In October 2010, Massachusetts enacted a law that forbids cell phone use by drivers under the age of 18. A policy analyst would like to determine whether the law has decreased the proportion of drivers under the age of 18 who use a cell phone. (Y u may f1nd It useful to reference the opproprlete table: z table or t table) e. Select the null and the alternative hypotheses to test the policy analyst's objective. He : p 0.82; Ha: p +8.82 He: P 8.82; HA: P8.82 b-1. 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? (Negative values should be Indicated by a minus sign. Round Intermedlete calculatlons to at least 4 decimal places and final answer to 2 declmal places.) b-2. Find the p-value. Op-value<0.01 0.01 s p-value<0.025 0.025 s p-value <o.05 0.05 sp-value<0.10 p-value z 0.10 c-1. At a 0.05, do you reject the null hypothesis? O Yes, since the p-value is greater than significance level. Yes, since the p-value is smaller than significance level. No, since the p-value is greater than significance level. No, since the p-value is smaller than significance level. c-2. What is the conclusion? o The law has been effective since the pvalue is less than the significance level. The law has not been effective since the pvalue is less than the significance level. The law has been effective since the p-value is greater than the significance level. The law has not been effective since the p-value is greater than the significance level.

Answer 1