[issue38490] statistics: add covariance, Pearson's correlation, and simple linear regression

[Tymek Wołodźko]

Change by Tymek Wołodźko <twolodzko at gmail.com>:


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title: statistics: add covariance and Pearson's correlation -> statistics: add covariance, Pearson's correlation, and simple linear regression

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38490>
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