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miss-islington merged 1 commit into from
Mar 1, 2019
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bpo-36018: Add documentation link to "random variable" #12114

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12 changes: 7 additions & 5 deletions Doc/library/statistics.rst
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Expand Up @@ -471,9 +471,11 @@ A single exception is defined:
:class:`NormalDist` objects
===========================

A :class:`NormalDist` is a a composite class that treats the mean and standard
deviation of data measurements as a single entity. It is a tool for creating
and manipulating normal distributions of a random variable.
:class:`NormalDist` is a tool for creating and manipulating normal
distributions of a `random variable
<http://www.stat.yale.edu/Courses/1997-98/101/ranvar.htm>`_. It is a
composite class that treats the mean and standard deviation of data
measurements as a single entity.

Normal distributions arise from the `Central Limit Theorem
<https://en.wikipedia.org/wiki/Central_limit_theorem>`_ and have a wide range
Expand Down Expand Up @@ -530,7 +532,7 @@ of applications in statistics, including simulations and hypothesis testing.

Using a `probability density function (pdf)
<https://en.wikipedia.org/wiki/Probability_density_function>`_,
compute the relative likelihood that a random sample *X* will be near
compute the relative likelihood that a random variable *X* will be near
the given value *x*. Mathematically, it is the ratio ``P(x <= X <
x+dx) / dx``.

Expand All @@ -544,7 +546,7 @@ of applications in statistics, including simulations and hypothesis testing.

Using a `cumulative distribution function (cdf)
<https://en.wikipedia.org/wiki/Cumulative_distribution_function>`_,
compute the probability that a random sample *X* will be less than or
compute the probability that a random variable *X* will be less than or
equal to *x*. Mathematically, it is written ``P(X <= x)``.

Instances of :class:`NormalDist` support addition, subtraction,
Expand Down