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:

AGE

18-29 30-49 50-63 65 or order

Smoked at least 1 cig.in past week 24 21 23 12

Did not smoke at least 1 cig in past wk 56 59 57 68