Add data README [#17]

jchester · jchester · commit 5b588a2fb0c9 · 2024-08-05T14:40:39.000-04:00
diff --git a/spec/data/README.md b/spec/data/README.md
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+# Data used in specs
+
+The data used in specs come from the subdirectories.
+
+* `montgomery` is data taken from Montgomery, Douglas C. _Introduction to Statistical Quality Control_, 8th EMEA Ed.
+* `synthetic` is data generated using PostgreSQL's `random_normal` function.
