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A researcher is studying the effect of a new fertilizer on plant growth. They have 20 plots of land. To eliminate the effect of soil fertility, they group the plots into 5 blocks based on soil quality, with 4 plots per block. This is an example of:
A researcher is studying the effect of a new fertilizer on plant growth. They have 20 plots of land. To eliminate the effect of soil fertility, they group the plots into 5 blocks based on soil quality, with 4 plots per block. This is an example of: