High productivity and carbohydrate storage ability of the Jerusalem artichoke make it a promising agricultural crop. The article “Leaf Gas Exchange and TuberYield in Jerusalem Artichoke Cultivars” (Field Crops Research [1991]: 241–252) reported on various plant characteristics. Consider the accompanying data on chlorophyll concentration (gm/m²) for four varieties of Jerusalem artichoke:

Suppose that the sample sizes were 5, 5, 4, and 6, respectively, and also that MSE = .0130. Do the data suggest that true average chlorophyll concentration depends on the variety? State and test the appropriate hypotheses using a significance level of .05.

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Variety Sample mean BI .30 RO .24 WA .41 TO .33