Money magazine (Money, March 2003) reports percentage returns and expense ratios for top bond funds under 4 categories: US government (G), high-yield corporate (H), tax-exempt (T), and world bond funds (W). Can we conclude that there is significant difference in the expense ratio among the 4 types of bond funds? Do a Kruskal–Wallis test at 5 percent.

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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