1. Drawing causation conclusions Ski and snowboard sales tend to rise and fall together, but sales of one don’t lead to sales of the other – they are both tied to an outside factor. Throughout grade school, mathematical skills correlate positively to height. Height doesn’t make you good at math, but older children are on […]

For a statistics exam, I wrote a question about the regression effect in application that I quite like. Here it is, with the answer this time. Q. A lab assistant in charge of measuring how long it takes for rats to run a maze predicts that usually a rat will take less time on its […]