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A researcher designs an experiment testing whether a new water treatment reduces soil salinity in agricultural plots. Twenty-four plots are arranged in a grid where soil salinity naturally decreases from north to south. The researcher randomly assigns 12 plots to the new treatment and 12 to a control. A colleague recommends using a blocked design with north-south pairs instead. What is the primary statistical advantage of blocking?
A researcher designs an experiment testing whether a new water treatment reduces soil salinity in agricultural plots. Twenty-four plots are arranged in a grid where soil salinity naturally decreases from north to south. The researcher randomly assigns 12 plots to the new treatment and 12 to a control. A colleague recommends using a blocked design with north-south pairs instead. What is the primary statistical advantage of blocking?