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    Z-Test

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    Hypothesis is it takes 25 minutes or less to serve a meal. The sample size was 20 people observed for 80 minutes. The average time it took for all people to be served was 24 minutes.

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    https://brainmass.com/statistics/z-test/problem-ztest-10922

    Solution Preview

    From your posting I believe you are asking how to tackle the problem with a Z-test. First of all your sample size of 20 is too low. And there needs to be a breakdown of the people into males and females. I have described this below.

    Your null hypothesis (NH) could be better written as:

    NH = any difference between the time taken to serve a ...

    Solution Summary

    The solution discusses the hypothesis is it takes 25 minutes or less to serve a meal. The sample size was 20 people observed for 80 minutes. The average time it took for all people to be served was 24 minutes.

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