bpo-38490: statistics: Add covariance, Pearson's correlation, and simple linear regression (#16813)

Co-authored-by: Tymoteusz Wołodźko <twolodzko+gitkraken@gmail.com
diff --git a/Misc/ACKS b/Misc/ACKS
index 760d6c7..7d9af85 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -1927,6 +1927,7 @@
 Klaus-Juergen Wolf
 Dan Wolfe
 Richard Wolff
+Tymoteusz Wołodźko
 Adam Woodbeck
 William Woodruff
 Steven Work
diff --git a/Misc/NEWS.d/next/Library/2019-10-16-08-08-14.bpo-38490.QbDXEF.rst b/Misc/NEWS.d/next/Library/2019-10-16-08-08-14.bpo-38490.QbDXEF.rst
new file mode 100644
index 0000000..82b9e33
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2019-10-16-08-08-14.bpo-38490.QbDXEF.rst
@@ -0,0 +1 @@
+Covariance, Pearson's correlation, and simple linear regression functionality was added to statistics module. Patch by Tymoteusz Wołodźko.
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