(Step-by-Step) Who has a longer life span? Test at .05 significance level. Non-drug user: Average life span = 82.5 years; standard deviation = 12 years; n
Question: Who has a longer life span? Test at .05 significance level.
Non-drug user: Average life span = 82.5 years; standard deviation = 12 years; n = 120
Drug user: Average life span = 72.5 years; standard deviation = 12.5 years; n = 50
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