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Are older men shorter than younger men? According to a national report, the mean height...

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Are older men shorter than younger men? According to a national report, the mean height for U.S. men is 69.4 inches. In a sample of 117 men between the ages of 60 and 69, the mean height was x=68.9 inches. Public health officials want to determine whether the mean height ? for older men is less than the mean height of all adult men. Assume the population standard deviation to be o=2.76. Use the a=0.01 level of significance and the P-value method with the TI-84 calculator.

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