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