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According to the latest census, there are 200 million adult Americans aged 20 and over. You...

According to the latest census, there are 200 million adult Americans aged 20 and over. You want to estimate the number of adult Americans in this age group who receive some form of government assistance. You plan to select a random sample and use sample results to build a 90% confidence interval. You want a sample size that will give an interval no wider plus or minus 1 million people. If a preliminary estimate of the number of adults receiving benefits is 40 million, how large a sample would you recommend?
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