Finding Confidence Intervals. In Exercises 9–16, assume that each sample is a simple random sample obtained from a population with a
15. Highway Speeds Listed below are speeds (mi/h) measured from southbound traffic on I-280 near Cupertino, California (based on data from SigAlert). This simple random sample was obtained at 3:30 PM on a weekday. Use the sample data to construct a 95% confidence
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