ed distribution, with N-1 degrees of freedom:
          </p>
<pre class="programlisting"><span class="identifier">chi_squared</span> <span class="identifier">dist</span><span class="special">(</span><span class="identifier">N</span> <span class="special">-</span> <span class="number">1</span><span class="special">);</span>
</pre>
<p>
            For each value of alpha, the formula for the confidence interval is given
            by:
          </p>
<div class="blockquote"><blockquote class="blockquote"><p>
