Minor changes

source/statistics/bayes_theorem.rst

@@ -1,2 +1,19 @@
 Bayes' Theorem
 ---------------
+
+This page is inpired from `MathIsFun <https://www.mathsisfun.com/data/bayes-theorem.html>`__.
+
+Video
+=========
+
+.. raw:: html
+         
+         <video controls class="align-center" width="320" height="240" src="../_static/videos/bayes_theorem.mp4"></video>
+
+Example
+=========
+
+Hunter says she is itchy. There is a test for Allergy to Cats, but this test is not always right:
+For people that really do have the allergy, the test says "Yes" 80% of the time
+For people that do not have the allergy, the test says "Yes" 10% of the time ("false positive")
+If 1% of the population have the allergy, and Hunter's test says "Yes", what are the chances that Hunter really has the allergy?

source/statistics/metrics.rst

@@ -65,6 +65,7 @@ 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
 -----------------------------