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In a recent season, the population standard deviation of the yards per carry for all running...

In a recent season, the population standard deviation of the yards per carry for all running backs was 1.80. The yards per carry of 13 randomly selected running backs are listed. Assume the yards per carry are normally distributed. Use the standard normal distrubution or the t-distribution to construct a 95% confidence interval for the population mean.    4.4    3.6 3.9 4.1 4.3 5.9 5.7 5.2    3.5    1.8    7.5    2.3 2.0

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