Minor changes

source/statistics/bessel_correction.rst

@@ -34,6 +34,7 @@ Lets compute the discrepency between population variance and the biased sample v
 
 
 This result shows us that the discrepency between the population and sample variance is :math:`\frac{\sigma^2}{n}`.
+It is simply, the :ref:`Standard Error of the Mean <SEM>`.
 From this result we can deduce how :math:`S_n^2` must be adjusted:
 
 .. math::

source/statistics/metrics.rst

@@ -64,6 +64,7 @@ When working with a sample, the following is an unbiased estimator of the standa
 
 To understand why denominator is :math:`n-1` see :ref:`Bessel's correction <bessel_correction>`.
 
+.. _sem:
 Standard Error of the Mean
 -----------------------------