Use the data from problem 99. At the a = 0.05, use Scheffe´’s multiple comparison to test for the difference between any pair.

Problem 99

Money magazine (Money, March 2003) reports percentage returns and expense ratios for top bond funds under four categories: US government (G), high-yield corporate (H), tax exempt (T), world bond funds (W). Can we conclude that there is significant difference in the mean expense ratio among the four types of bond funds? Do a 5 % test, using a one-way ANOVA.

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G 5.0 4.9 4.5 3.6 3.9 4.4 4.5 4.9 H 9.7 8.8 7.6 7.1 7.1 8.0 9.7 8.4 T 5.6 5.1 4.5 3.0 4.5 3.6 5.0 4.2 W 4.5 4.2 7.4 8.8 3.4 4.0 4.4 3.7