#14 . Listed below are speeds (mi/h) measured from southboundtraffic on I-280 near Cupertino, CA. This simple random sample wasobtained at 3:30 p.m. on a weekday. Use a 0.05 significance levelto test the claim of the highway engineer that the standarddeviation of speeds is equal to 5.0 mi/h. (With a 95% confidence)62 61 61 57 61 54 59 58 59 69 60 67
A) Construct a confidence interval using the confidence levelprovided.
B) Test the hypothesis
C) Enter the results in excel as following
confidence level critical value confidence interval
XL^2
XR^2
