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example 9.4 an economist wants to know if the proportion of the U.S population who commutes to work via carpooling is on the rise. what sample size should be obtained if the economist wants to make an estimate within 2 percentage points of the true population w 90% confidence ifa. the economist uses the 2009 estimate of 10% obtained from the American community survey ?b. the economist does not use any prior estimate ?

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