##### Question

# A researcher wishes to compare the effects of two fertilizers on the yield of a s…continues

A researcher wishes to compare the effects of two fertilizers on the yield of a soybean crop. She has 20 plots of land available and she decides to use a pairedexperiment – using 10 pairs of plots. Thus, she will

(a) use a table of random digits to divide the 20 plots into 10 pairs and then, for each pair, flip a coin to assign the fertilizers to the 2 plots.

(b) subjectively divide the 20 plots into 10 pairs (making the plots within a block as similar as possible) and then, for each pair, flip a coin to assign thefertilizers to the 2 plots.

(c) use a table of random digits to divide the 20 plots into 10 pairs and then use the table of random digits a second time to decide upon the fertilizer to be appliedto each pair.

(d) flip a coin to divide the 30 plots into 10 pairs and then, for each pair, use a table of random digits to assign the fertilizers to the 2 plots.

(e) use a table of random digits to assign the 2 fertilizers to the 20 plots and then use the table of random digits a second time to place the plots into 10 pairs.