An investigation was conducted to determine the source of reduction in yield of a certain chemical product. It was known that the loss in yield occurred in the mother liquor, that is. The material removed at the filtration stage. It was felt that different blends of the original material may result in different yield reductions at the mother liquor stage. The following are results of the percent reduction for 3 batches at each of 4 preselected blends:

(a) Perform the analysis of variance at α = 0.05 level of significance.

(b) Use Duncan's multiple-range test to determine which blends differ.

(c) Do part, (b) using Tukey's test.

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Blend 3 25.6 25.2 24.3 20.8 31.6 29.8 22.2 34.3 28.6 26.7 24.7 27.9