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Listed below are speeds​ (mi/h) measured from traffic on a busy highway. This simple random sample...

Listed below are speeds​ (mi/h) measured from traffic on a busy highway. This simple random sample was obtained at​ 3:30 P.M. on a weekday. Use the sample data to construct a 98​% confidence interval estimate of the population standard deviation. 63 64 64 55 64 53 61 60 61 69 62 68

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