an economist wants to estimate the mean per capita income (in thousands of dollars) for a major city in california. he believes that the mean income is $21.2, and the standard deviation is known to be $9.3. how large of a sample would be required in order to estimate the mean per capita income at the 95% level of confidence with an error of at most $0.68? round your answer up to the next integer.

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04-11-2022
Mathematics

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an economist wants to estimate the mean per capita income (in thousands of dollars) for a major city in california. he believes that the mean income is $21.2, and the standard deviation is known to be $9.3. how large of a sample would be required in order to estimate the mean per capita income at the 95% level of confidence with an error of at most $0.68? round your answer up to the next integer.

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