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using chi square table to find the critical value

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?