(Answered) An economist wants to estimate the mean per capita income

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An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city in Texas. He believes that the mean income is $23.8, and the standard deviation is known to be $8.9. How large of a sample would be required in order to estimate the mean per capita income at the 98% level of confidence with an error of at most $0.31?

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