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A study of seat belt users and nonusers yielded the randomly selected sample data summarized in the accompanying table. Use a 0.05 significance level to test the claim that the amount of smoking is independent of seat belt use. A plausible theory is that people who smoke are less concerned about their health and safety and are therefore less inclined to wear seat belts. Is this theory supported by the sample data?
0_cigarettes 1-14_cigarettes 15-34_cigarettes 35_and_over_cigarettes
Wear_Seat_Belts 152 12 39 7
Don't_Wear_Seat_Belts 143 15 30 9
Determine the null and alternative hypothesis
Use the chi-square table to find the critical value.
Use a 0.05 significance level to test the claim that the amount of smoking is independent of seat belt use. A plausible theory is that people who smoke are less concerned about their health and safety and are therefore less inclined to wear seat belts. Is this theory supported by the sample data?
