Science is not just for scientists. The methods of thought that underlie science are useful in all sorts of everyday contexts. Most obviously, everyone needs to be able to think like a scientist in order to interpret scientific results—you know, those newspaper headlines like “PAPER CLIP USE MAY LOWER IQ IN PREGNANT WOMEN!!” In that spirit, I’m going to write about some key concepts for thinking like a scientist. Today: sample size.
Pop quiz! You read this (totally made up) report: “Two groups of ten age- and health-matched men were monitored for heart disease. One group was given pet ferrets, while the other was not. The ferret-owning men were 8% less likely to develop heart disease over a five year period.” So: is it time to run out and get a ferret for the sake of your heart health?