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Sample Selection and Data Collection In this stage, the firm identifies the target audience and determines the appropriate sample size to ensure representativeness

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In this analysis of the DNA of cancers linked to smoking, researchers studied over 5,000 tumors and compared cancers from smokers with cancers from people who had never smoked

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That would involve taking a group of say 6,000 people, selecting 3,000 at random and forcing them to smoke for 5 years, while forcing the other 3,000 not to smoke for 5 years, and then comparing the incidence of lung cancer in the two groups, says Donald Gillies, an emeritus professor of philosophy of science and mathematics at University College London