Imagine I randomly select a group of smokers and a group of nonsmokers. I then measure lung
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Imagine I randomly select a group of smokers and a group of nonsmokers.
I then measure lung disease in each group. What type of design is this? If I observe a difference between the groups in rate of lung disease, why can’t I conclude that this difference is caused by smoking?
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Muhammad Umair
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Related Book For 
Research Methods And Statistics A Critical Thinking Approach
ISBN: 9780495510017
3rd Edition
Authors: Sherri L. Jackson
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