product
2 free lessons tagged product across Business. Each one is a short sequence of focused steps with narration and a five-question quiz at the end — take them in any order, no signup required.
Why Everything Gets Tested, and What a Test Actually Is
The companies famous for experimentation did not adopt it out of statistical enthusiasm: they adopted it because their own data showed most confident product ideas fail to improve the metrics they target. This lesson covers why observational product data misleads, what randomisation actually buys, the choice of randomisation unit, and the humbling base rates reported by the teams who measured.
Why before-and-after fools you
You change the button, sales rise, you conclude the button worked, and you may be completely wrong. Learn why comparing before and after is one of the most reliable ways to fool yourself, what a controlled experiment does differently, why randomization is the whole trick, and how the A/B test turns a guess about cause into something you can actually measure.