Let represent the population mean profit as a percentage of stockholder equity for retail stocks, and let represent the population mean profit as a percentage of stockholder equity for utility stocks. find a confidence interval for .

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# Let represent the population mean profit as a percentage of stockholder equity for retail stocks, and let represent the population mean profit as a percentage of stockholder equity for utility stocks.

Let represent the population mean profit as a percentage of stockholder equity for retail stocks, and let represent the population mean profit as a percentage of stockholder equity for utility stocks. find a confidence interval for .