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A Hypothesis Tesing With Asthma Case

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The mean PEF for children free of asthma is 306. An investigator wants to test whether children with asthma have restricted PEF. A sample of 40 children are studied and their mean PEF is 279 with a standard deviation of 71. Is there statistical evidence of a lower mean in PEF in children with asthma? Alpha = 0.05
Critical z value =

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The solution gived detailed steps on hypothesis tesing when alpha is 0.05. All formula and calcuations are shown and explained.

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Ho: children with asthma do not have a lower mean in PEF
Ha: children with ...

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