On the back is a picture of such and assignment and the yields, in bushels per acre, for each plot. This indicates that although variety A has a slightly higher mean yield than variety B, the two varieties are not statistically different. This is probably not a fair comparison. One side of the field may be more fertile than the other or get more water than the other. There could be many lurking variables that could be affecting the yields.
Many people think that an alternating sequence is a random, or at least an unbiased, sequence.
Below 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. This indicates that although variety B has a slightly higher mean yield than variety A, the two varieties are not statistically different. Assignment Below is one possible random assignment of varieties to plots. This randomization was accomplished using a six sided die.