Question: John asks whether eating school lunch versus lunch brought from home leads to higher or lower weight in school-aged children. A sample if 100 children

John asks whether eating school lunch versus lunch brought from home leads to higher or lower weight in school-aged children. A sample if 100 children who bring their lunch from home produces a mean of 122 and the mean for those that consume school lunch is = 135 and standard deviation = 120.

a. should he use a one-tailed test or a two-tailed test and why?

b. what is the null hypothesis? what is the alternative hypothesis?

c. with a alpha=0.05, what is the critical value for this test?

d. compute Zobt

e. what should we conclude about this relationship?

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