13.)A survey is commissioned to study the weight of NFL players at certain positions.  Of the 188 active NFL running backs, a simple random sample of size 16 is selected and the sample mean is determined to be \overline{x}=x= 219.3 pounds.  It is known that the standard deviation is \sigma=σ= 6.8 pounds.  Compute a 95% confidence interval for \muμ.  Please show work! a. 222.632 b. 219.3 ± 3.332 c. 219.3 ± 0.833 d. 219.3 ± 4.364

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