It was just harder than any other technical test I've ever had. They asked things that not even the smartest people I know would have been able to answer on the spot (over the phone).
Would you have known it without having to look it up? I'm just saying that there is some reasonable limit to what you should be expected to know offhand.
For our startup we tend to look a lot more for general intelligence and ability to figure things out fast rather than rote memorization of formulas. I know somebody who is smart can look that up in a book and figure it out.
I think it is totally fair that they expect somebody to have a good comprehension of stats for what they are working on, maybe even to be a stats master, but I know people who have majored in math and are very smart that would still have to look some of that stuff up.
I'm just saying that the style of the technical questions they asked may filter out some great candidates.
What is the rationale behind long work hours?