Two groups of randomly selected 1-acre plots were treated with two different brands of fertilizer. The following data give the yields of corn (in bushels) from each of these plots.

Use the data to determine whether there is a difference in yields for two brands of fertilizers. Use α = 0.01. State any assumptions you made to solve the problem.

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Ferice 89 3 105 94929 101 Fertilizer l 85 88 94 87 86 91