Listed below are speeds(mi/h) measured from traffic on a busy highway. This simple random sample was obtained at3:30 P.M. on a weekday. Use the sample data to construct a 95%confidence interval estimate of the population standard deviation.

63

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60

55

60

52

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60

61

68

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66

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Part 1

The confidence interval estimate is

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mi/h<<

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mi/h.

(Round to one decimal place asneeded.)