the head injury recorded from the crash test dummies in the drivers seats are as follows: 681,428,917,898, and 420. new…

the head injury recorded from the crash test dummies in the drivers seats are as follows: 681,428,917,898, and 420. new car designs specifications are being considered to control the variation of the head injury measurements. use the sample data to construct a 95% confidence interval estimate of the population standard deviation.
 
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