A researcher is testing the effect of a new fertilizer on crop growth. He marks 30 plots in a field, splits the plots in half, and randomly assigns the new fertilizer to one half of the plot and the old fertilizer to the other half. After 4 weeks, he measures the crop yield and compares the effects of the two fertilizers. This design is an example of
A) This is not an experiment
B) Double-blind experiment
C) Matched pairs experiment
D) Cluster experiment
E) Completely randomized comparative experiment
Answer: Matched pairs experiment
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