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    Z test for population mean

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    Historically, monthly sales for product X has been averaging $30M with a standard deviation of $2M. Last month sales decreased to $28.5M, should you be concerned that sales are decreasing. Try to you use statistics to support you explanation.

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    https://brainmass.com/statistics/z-test/z-test-for-population-mean-293811

    Solution Summary

    Step by step method for computing test statistic for Z test.

    $2.19

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