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<p>for <a href="page.php?w=systematic_error">systematic error</a>s.</p>

<p>For example, in experiments where <a href="page.php?w=crop_yield">crop yield</a> is affected (e.g. <a href="page.php?w=soil_fertility">soil fertility</a>), the experiment can be controlled by assigning the treatments to randomly selected plots of land. This mitigates the effect of variations in soil composition on the yield.</p>

<p><big>Blind experiments</big></p>
<p>Blinding is the practice of withholding information that may <a href="page.php?w=bias">bias</a> an experiment. For</p><p>
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