title: variance implementation applied to calculate the standard deviation?
body: <p>I'm using the Math-library in Java to calculate some statistics. My questions concerns the class <code>DescriptiveStatistics</code></p>
  
  <pre><code> org.apache.commons.math.stat.descriptive.DescriptiveStatistics
  </code></pre>
  
  <p>If I use the method <code>setVarianceImpl(...)</code>, is it applied to the calculation of the standard deviation (<code>getStandardDeviation(...)</code>). I guess so, but I cannot find any documentation on this?</p>
  
  <p>Correct me, if I am wrong.</p>