A stock analyst wants to determine whether there is a difference in the mean rate of

Chapter 0, Problem 14

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A stock analyst wants to determine whether there is a difference in the mean rate of return for three types of stock: utility, retail, and banking stocks. The following output is obtained: Exercises 11. Given the following sample information, test the hypothesis that the treatment means are equal at the .05 significance level. Lin01803_ch12_410-460.qxd 11/2/10 10:23 PM Page 429 Example WARTA, the Warren Area Regional Transit Authority, is expanding bus service from the suburb of Starbrick into the central business district of Warren. There are four routes being considered from Starbrick to downtown Warren: (1) via U.S. 6, (2) via the West End, (3) via the Hickory Street Bridge, and (4) via Route 59. WARTA conducted several tests to determine whether there was a difference in the mean travel times along the four routes. Because there will be many different drivers, the test was set up so each driver drove along each of the four routes. Below is the travel time, in minutes, for each driverroute combination. 430 Chapter 12 a. Using the .05 level of significance, is there a difference in the mean rate of return among the three types of stock? b. Suppose the null hypothesis is rejected. Can the analyst conclude there is a difference between the mean rates of return for the utility and the retail stocks? Explain