A police officer is concerned about speeds on a certain section of Interstate 95. He records the speeds of 40 cars on a Saturday afternoon. The data set, labeled Highway_Speeds, can be found on the text website.
a. The speed limit on this portion of Interstate 95 is 65 mph. Specify the competing hypotheses in order to determine if the average speed differs from the speed limit.
b. Specify the critical value(s) of the test at the 1% significance level.
c. Compute the value of the test statistic.
d. At α = 0.01, are the officer’s concerns warranted? Explain.

  • CreatedJanuary 28, 2015
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