Question

The weights (x) of 300 adult males were determined and used to test the hypothesis that the weights are normally distributed with a mean of 160 lb and a standard deviation of 15 lb. The data were grouped into the following classes.
Using the normal tables, the percentages for the classes are 2.28%, 13.59%, 34.13%, 34.13%, 13.59%, and 2.28%, respectively. Do the observed data show significant reason to discredit the hypothesis that the weights are normally distributed with a mean of 160 lb and a standard deviation of 15 lb? Use a = 0.05
a. Verify the percentages for the classes.
b. Solve using the p-value approach.
c. Solve using the classical approach.


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  • CreatedAugust 28, 2015
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