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According to a Survey, the Mean Height for Men Is xˉ=68.5\bar { x } = 68.5

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According to a survey, the mean height for men is 68.6 inches. In a sample of 320 men between the ages of 60 and 69 , the mean height was xˉ=68.5\bar { x } = 68.5 inches. Public health officials want to determine whether the mean height μ\mu for older men is less than the mean height of all adult men. Assuming the population standard deviation to be σ=2.85\sigma = 2.85 inches, compute the value of the test statistic.

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