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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 an 80​% confidence interval estimate of the population standard deviation. 64 62 62 56 62 53 60 59 60 70 61 69 LOADING... Click the icon to view the table of​ Chi-Square critical values. The confidence interval estimate is nothing ​mi/h less thansigmaless than nothing ​mi/h. ​(Round to one decimal place as​ needed.) Does the confidence interval described the standard deviation for all times during the week

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