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    Random sample

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    In Alleghaney county a random sample of 19 residents had a mean annual income of $30,800 with a standard deviation of $8600. In Erie County, a random sample of 15 residents had a mean annual income of $25,700 with a standard deviation of $5500. Find a 90% confidence interval for the difference in mean salary.

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    Solution Summary

    In Alleghaney county a random sample of 19 residents had a mean annual income of $30,800 with a standard deviation of $8600. In Erie County, a random sample of 15 residents had a mean annual income of $25,700 with a standard deviation of $5500. Find a 90% confidence interval for the difference in mean salary.

    $2.19

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