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 90% confidence interval estimate of the population standard deviation. 61 63 63 57 63 52 60 59 60 70 62 68 The confidence interval estimate is ------mi/h < σ <------ mi/h. (Round to one decimal place as needed.) Does the confidence interval describe the standard deviation for all times during the week? Choose the correct answer below. A. No. The confidence interval is an estimate of the standard deviation of the population of speeds at 3:30 on a weekday, not other times. B. Yes. The confidence interval describes the standard deviation for all times during the week.

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orchestra answered 1 year ago

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