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 99% confidence interval estimate of the population standard deviation. 60 63 63 55 63 54 61 60 61 69 58 66
The confidence interval estimate is ___ mi/h <σ< ___ mi/h.
