Compare the level of mean FEV between smokers and nonsmokers separately for 10- to 14-year-old boys, 10-
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Compare the level of mean FEV between smokers and nonsmokers separately for 10- to 14-year-old boys, 10- to 14-year-old girls, 15- to 19-year-old boys, and 15- to 19-year-old girls?
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For each of the 4 AgeSex groups under investigation we find no significant differences in variance o...View the full answer
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