.@willob on how Guinness gave us Student’s t-test “I studied math in college, and one of the tests from that is the Student’s t-test. This is how you derive either the standard deviation if you know the mean, or the mean if you know the standard deviation from a small sample, less than 30. This was a problem at Guinness because one of the biggest predeterminants of the quality of a pint of Guinness is the amount of lipids or fats in hops. So, they were having to take up hundreds of hops to see is this a high-quality batch or not? And they were losing a few percent per batch. And that means a lot when you’re in the high-volume, low-margin food-and-beverage industry. So William Sealy Gosset had to publish under a pseudonym. That's why it's called the Student's t-test.”