B. She has a a field with 36 plots available for the experiment. B. She wishes to see if the two varieties have equal yields, on average, or if the two varieties differ significantly. It is easiest to plant one variety on 18 plots on one side of the field and the other variety on the 18 plots on the other side. On the back is a picture of such and assignment and the yields, in bushels per acre, for each plot. Perform the appropriate test of hypothesis.
Many people think that an alternating sequence is a random, or at least an unbiased, sequence.
On the back is a picture of an alternating pattern, like a checkerboard, and the yields, in bushels per acre, for each plot. The summary of those yields is given below. Think about the results of the two tests of significance, the convenience assignment and the alternating assignment. Some may find it a bit disturbing that B appears better in one study and A appears better in the other. Of course, this could be due to chance variation.