e
test data. <span class="math inline">\(\sigma^{2}\)</span> is the
variance estimate used in the standard paired <span class="math inline">\(t\)</span>-test (which simply has <span class="math inline">\(\frac{\sigma}{\sqrt{n}}\)</span> in the
denominator where <span class="math inline">\(n\)</span> is the sample
size in this case).</p>
</div>
<div class="section level3">
<h3 id="k-fold-cross-validation-correction">k-fold cross-validation correction<a class="anchor" aria-label="anchor" href="#k-fold-cross-v