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A national survey of seventh graders found a mean weight of 111 pounds. A researcher wondered...

A national survey of seventh graders found a mean weight of 111 pounds. A researcher wondered whether seventh graders at her school differed from this value. She measured the weight of a random sample of 25 seventh graders and found a mean of 116 with a standard deviation estimate (i.e., �̂) of 10.0. Test the viability of the hypothesis that µ = 111. Calculate the 95% confidence interval as well.

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