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Hypothesis test

In the news recently a New Jersey representative wants to introduce a bill banning smoking while driving to save lives.
What study would you design to support his case?
What is the null hypothesis? Alternative hypothesis? How would you sample? How many would you include in your sample? What level of significance would you choose?

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I would design a study to test the hypothesis that the frequency of car crashes among drivers who smoke is higher than the drivers who do not smoke during driving. To test this, I would test the following ...