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:

a. Using the .05 level of significance, is there a difference in the mean rate of return among the three types of stock?
b. Can the analyst conclude there is a difference between the mean rates of return for utility and retail stocks? For utility and banking stocks? For banking and retail stocks?Explain.

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Source DF Factor 2 81.11 40.56 15.61 0.000 Error 14 36.37 2.60 Total 16 117.48 MS S- 1.612 R-Sq 69.04% R-Sq (adj ) -64.629 - Level Utility Stocks 5 16.520 1.611 Retail Stocks 6 11.492 0.378 Banking Stocks 6 15.547 2.249 Mean StDev utility Stocks subtracted from: Lower Center Upper tocks 7.121 5.028 -2.935 Banking Stocks 3.066 -0.972 1.121 Retail Stocks Banking Stocks 7.0 -3.5 0.0 3.5 Retail Stocks subtracted from: Lower Center Upper Banking Stocks 2.060 4.056 6.051 Banking stocks -3.5 0.0 3.5