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    Z Test for Comparison of Population Mean

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    Based on the information given for each of the following studies, decide whether to reject the null hypothesis. For each, give

    (a) the Z-score cutoff (or cutoffs) on the comparison distribution at which the null hypothesis should be rejected,
    (b) the Z score on the comparison distribution for the sample score, and
    (c) your conclusion. Assume that all populations are normally distributed.

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    https://brainmass.com/statistics/z-test/z-test-for-comparison-of-population-mean-329034

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    The solution gives a step by step method for computing Z test statistic for comparing population mean.

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