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

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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 ...

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