span class="emphasis"><em>n</em></span> degrees of freedom, then the test statistic:
        </p>
<p>
          F<sub>n,m</sub> &#160; = (&#967;<sup>2</sup><sub>n</sub> &#160; / n) / (&#967;<sup>2</sup><sub>m</sub> &#160; / m)
        </p>
<p>
          Is distributed over the range [0, &#8734;] with an F distribution, and has the
          PDF:
        </p>
<p>
          <span class="inlinemediaobject"><img src="../../../../equations/fisher_pdf.svg"></span>
        </p>
<p>
          The following graph il