Statistics: Testing Hypothesis with the Z-statistic – #152

Question: A study is made of men over the age of 50. Each man is classified as
to whether or not he has had a hart attack and the amount that he smokes
at the present time. The following results were obtained for a sample of
300 men

At .05 significance level, is there a difference in the distribution of heart attacks based on the amount smoked?


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