eConfidenceInterval(),
 getSlope() + getSlopeConfidenceInterval())</code></p>
 <p>
 To request, for example, a 99% confidence interval, use
 <code>alpha = .01</code></p>
 <p>
 <strong>Usage Note</strong>:<br>
 The validity of this statistic depends on the assumption that the
 observations included in the model are drawn from a
 <a href="http://mathworld.wolfram.com/BivariateNormalDistribution.html">
 Bivariate Normal Distribution</a>.</p>
 <p>
 <strong> Preconditions:</strong><ul>
 <li>If there are fewer th