2) A study was conducted to compare the sodium content in four brands of tuna fish. Five samples were obtained from each brand, and the amount of sodium (mg) per can was measured. The results of the analysis of variance were: Dependent Variable: sodium Sum of Source DF Squares Mean Square F Value Pr > F Brand 3 37854.15 12618.05 67.82 .0001 Error 16 2976.8 186.05 Corrected Total 19 40830.95 The sample means were: Brand A 252.2, Brand B 296., Brand C 180., and Brand D 212. a) Use Tukey’s method to test if Brands A and B have different population means at a = .05.

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