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In a study of high school students at least 16 years of age, researchers obtained survey...

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Basic Math

In a study of high school students at least 16 years of age,researchers obtained survey results summarized in the accompanyingtable (based on data from Texting While Driving and Other RiskyMotor Vehicle Behaviors Among U.S. High School Students, byOMalley, Shults, and Eaton, Pediatrics, Vol. 131, No. 6).

Use a 0.05 significance level to test, by hand, the claim ofindependence between texting while driving and irregular seat beltuse:

  1. (a) State the null and alternative hypotheses, indicate thesignificance level and the type of test (left-, right-, ortwo-tailed test).

  2. (b) Calculate by hand the test statistic

  3. (c) Use the ?2 table to identify the critical value

  4. (d) Use the test statistic and critical value to explain whetheror not the null hypothesis is rejected.

  5. (e) Make a concluding statement.

  6. (f) Are those two risky behaviors independent of each other?

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