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ron has a family history of high blood pressure. he has studied the causes, signs, and possible outcomes of the disease. what kind of strategy has he used to improve his health
Unfortunately, it is all too easy to treat correlations from observational studies as if they were causal. Suppose, for example, that in a certain population, 50 percent of people live to the age of 80. But of those who regularly exercise, that figure is 70 percent. So, if you select a person at random from the whole population, there is a 50 percent probability that person lives to 80, but if you select only from those who regularly exercise, the probability increases to 70 percent. You might...

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