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18. To estimate the mean speed of a certain pitcher's fast ball, a sample of nine fastballs thrown by a certain pitcher were measured. The

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18. To estimate the mean speed of a certain pitcher's fast ball, a sample of nine fastballs thrown by a certain pitcher were measured. The sample provided a mean speed of 88.56 mph and a standard deviation of 7.161 mph. When constructing a confidence interval to estimate the mean speed of the pitcher's fast ball, would you use a z or a t value to construct the interval and why

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