For laboratory studies of an organism, it is important to provide a medium in which the organism flourishes. The data for this exercise shown in Table 6.33 are from a completely randomized design with four samples for each of seven media. The response is the diameters of the colonies of fungus.

(a) Perform an analysis of variance to determine whether there are different growth rates among the media.

(b) Explore all possible pairwise comparisons, organizing the results with an appropriate summary display.

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Medium Table 6.33 Data for Exercise 18. Fungus Colony Diameters WA 4.5 4.1 4.4 4.0 RDA 7.1 6.8 7.2 6.9 PDA 7.8 7.9 7.6 7.6 CMA 6.5 6.2 6.0 6.4 TWA 5.1 5.0 5.4 5.2 PCA 6.1 6.2 6.2 6.0 NA 7.0 6.8 6.6 6.8