CogniPrep shows people whether their practice scores are going anywhere. That sounds like a charting problem and it is not. The moment you put an arrow next to someone's history you have made a claim, and with the sample sizes a practice product actually has, eight attempts, maybe twelve, the h...
Source: [Dev.to](https://dev.to/daniel_pertu/you-improved-is-a-statistical-claim-and-on-eight-attempts-it-is-usually-false-2m6h)