d-standard-deviation" class="section level3">
<h3 number="4.1.3"><span class="header-section-number">4.1.3</span> Sample Mean, Variance, and Standard Deviation</h3>
<p>The sample mean, variance, and standard deviation are calculated in
the usual way. For i.i.d. draws from a distribution of finite mean,
the sample mean is an unbiased estimate of the mean of the
distribution. Similarly, for i.i.d. draws from a distribution of
finite variance, the sample variance is an unbiased estimate of the
variance.<a href