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 95% confidence interval estimate of the population standard deviation.
64
61
61
56
61
52
59
58
59
68
60
69
The confidence interval estimate is ____ mi/h < σ < ____ mi/h.
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