Controlling for Confounding Variables
A researcher plans to compare the effects of four different fertilizers on crop yield using 20 small plots of land. The soil quality is known to vary among the plots. Which of the following is the most important consideration in designing this experiment?
A
Accounting for the natural variability in soil quality
B
Simplifying the statistical analysis procedures
C
Minimizing the total amount of fertilizer used
D
Ensuring equal numbers of plots for each fertilizer
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