Statistics: Z-test: Testing hypotheses – #135

Question: Suppose researcher wants to investigate whether proportion of smokers within different age groups is the same. He divides the American population into 4 age groups. Within each age group, he surveys 80 individuals and asks, "have you smoked at lease one cigarette in the past week?". Test at the .01 level. State hypotheses and identify claim, find critical value(s), compute test value, make decision, summarize results. Results of survey are as follows:


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