Corn was grown on 12 plots of land. Half of each plot was treated with fertilizer A, and the other half was treated with fertilizer B. Yields in bushels per acre were as follows. Can you conclude that the median yield differs between the fertilizers?

Use the α = 0.05 level of significance.

a. Compute the value of the test statistic.

b. Find the critical value.

c. State a conclusion.

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1 2 3 4 5 67 8 9 10 11 12 Fertilizer A 170 145 139 146 138 132 174 164 151 158 145 153 Fertilizer B 155 128 125 142 133 135 152 154 147 137 146 129