This is a stat class for biology major.

Thirty adults, aged 40 to 49, were recruited for a five-year study of the relationshipbetween smoking status and weight gain. Ten adults were lifelong nonsmokers, tenwere moderate smokers and continued to smoke throughout the study, and ten quitsmoking at baseline and remained smoke-free throughout the study. Their weight gainover the five years of the study is summarized below:

Weight gain (1b) Smoker status sample size sample mean sample standard deviation Nonsmokers 10 5 Moderate smokers 10 7 Quitters 10 12