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  3. #14 . listed below are speeds (mi/h) measured from

#14 . Listed below are speeds (mi/h) measured from southbound traffic on I-280 near Cupertino, CA....

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Basic Math

#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

Answer & Explanation Solved by verified expert
4.1 Ratings (881 Votes)
Values X Xi X26217777610111161011115713444761011115444444959277795871113592777969694439600444567401107Total72801826668Mean X Xi nX 728 12 606667Sample Standard deviation SX Xi X 2 n 1SX 1826668 12 1 40751Part    See Answer
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