Question

A study by Allstate Insurance Co. finds that 82% of teenagers have used cell phones while dring (The Wall Street Journal, 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 lke to determine whether the law has decreased the proportion of drlvers under the age of 18 who use a cell phone. (You may find It useful to reference the eppropriate table: z table or ttable) a. Select the null and the alternative hypotheses to test the policy analyst's objective О не: p 9.82; HA: p # 0.32 О не: р 9.82; HA: p > 9.82 Оне: p 9.82; HA: p < 9.82 b-1. Suppose a sample of 200 drivers under the age of 18 results In 150 who still use a cell phone whlle driving. What is the value of the test statistic? (Negatlve values should be Indicated by a minus sign. Round Intermedlate calculatlons to at least 4 decimal places and final answer to 2 declmal places.) Test statistic b-2. Find the p-value O p-value<0.01 0.01 s p-value < 0.025 0.025 S p-value<0.05 0.05 s p-value<0.10 Op-value 2 010 C-1. Ata 0.05, do you reject the null hypothesis? O Yes, since the p-value is greater than significance level O Yes, since the p-value is smaller than significance level. No, since the p-value is greater than significance level. O No, since the p-value is smaller than significance level. c-2. What Is the conclusion? O The law has been effective since the p-value is less than the significance level. O The law has not been effective since the p-value is less than the significance level O The law has been effective since the p-value is greater than the significance level. O The law has not been effective since the p-value is greater than the significance level.

Answer 1

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