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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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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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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 ...

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This quiz covers basic terms and definitions of statistics.

##### Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.