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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 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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