Anyone who has done A/B testing knows that you need tens of thousands of data points to pick up any causal relationship unless it’s a huge effect like the reten

Anyone who has done A/B testing knows that you need tens of thousands of data points to pick up any causal relationship unless it’s a huge effect like the retention impact of telling your customers to lick a donkey’s balls. No way you could pick it up for a teacher with 30 kids a year except over that teachers entire career.