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    Critical z value

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    Use formula z=(mean of values in sample - mu subscript mean of values in sample) divided by (lower case sigma divided by sqrt number of values in sample)

    The claim is mu = 73.4 and sample statistics include n=35, mean of values in sample = 69.5, and s=8.7.

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    https://brainmass.com/statistics/hypothesis-testing/critical-z-value-formulas-18202

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    Please see attached file.

    Use formula z=(mean of values in sample - mu subscript mean of values in sample) divided by (lower case sigma divided by sqrt number of values in sample)
    The claim is mu = 73.4 ...

    Solution Summary

    The expert uses the critical z value formulas for the mean of values in samples.

    $2.49

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