Watching different Data Science & Statistics training videos one statement that comes up often is “Correlation does not imply causation”.
Wikipedia defines this as:
Correlation does not imply causation is a phrase used in science and statistics to emphasize that a correlation between two variables does not necessarily imply that one causes the other.
The xkcd comic site has a great strip on the subject
To illustrate this further, there are a number of Graphs that have been put together that visualise why Correlation does not imply causation.
If however Mozzarella Cheese is ever found as a link to Engineering Doctorates it will be time to by shares in the cheese manufacturing companies as sales would soar!