Highway Speeds Listed below are speeds (mi/h) measured from southbound traffic onI-280 near Cupertino, California (based on data from SigAlert). This simple random sample was obtained at 3:30 p.m. on...

Highway Speeds  Listed below are speeds (mi/h) measured from southbound traffic onI-280 near Cupertino, California (based on data from SigAlert). 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 describethe standard deviation for all times during the week?