A/B testing

<div class="experiment"><div class="sample">SAMPLE <b id="sample">200</b> / GROUP</div><div class="plot"><div class="variant"><span>A · CONTROL</span><div class="bar"><i class="a"></i><em class="aerr"></em></div><b>8.0%</b></div><div class="variant"><span>B · NEW</span><div class="bar"><i class="b"></i><em class="berr"></em></div><b>9.2%</b></div></div><div class="foot">UNCERTAINTY NARROWS AS SAMPLE GROWS</div></div>

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