Question
In a study, the body mass index (BMI) of smokers and nonsmokers were measured at a baseline value and at follow up after 6 years.
In a study, the body mass index (BMI) of smokers and nonsmokers were measured at a baseline value and at follow up after 6 years.
The smokers smoked one pack a day and then quit for 6 years. The nonsmokers never smoked.
The BMI of the smokers were taken before they quit (baseline BMI) and again at the 6 year mark after they had quit (follow up BMI).
The BMI of the nonsmokers were taken at a baseline BMI and again at the 6 year mark (follow up BMI)
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Elementary Linear Algebra with Applications
Authors: Howard Anton, Chris Rorres
9th edition
471669598, 978-0471669593
