Question: Highway Speefs Listed below are speeds mi h measured from southbound

Highway Speefs Listed below are speeds (mi/h) measured from southbound traffic on I-280 near Cupertino, California (based on data from Sig Alert). 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. Does the confidence interval describe the standard deviation for all times during the week?
62 61 61 57 61 54 59 58 59 69 60 67
Assume that each sample is a simple random sample obtained from a population with a normal distribution.

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  • CreatedMay 03, 2015
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