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Below are speeds (m/h) measured from traffic on a busy highway. This sample random was obtained at 3:30 P.M. on a weekend. Use the sample

Below are speeds (m/h) measured from traffic on a busy highway. This sample random was obtained at 3:30 P.M. on a weekend. Use the sample data to construct a 99% confidence interval estimate of the population standard deviation. 60;63;63;55;63;55;59;58;59;70;62;67. What's the confidence interval estimate m/h

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