Use the sample data to construct a 95​% confidence interval estimate of the population standard deviation.

MATLAB: An Introduction with Applications
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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.

60        65        65        57        65        55        59        58        59        70        58        66

The confidence interval estimate is    < σ <   mi/h.

Does the confidence interval describe the standard deviation for all times during the​ week? Choose the correct answer below.

  1. 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.
  2. Yes. The confidence interval describes the standard deviation for all times during the week.
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