Population or sample variance?

This deck uses population variance (divide by n); sample variance divides by n−1.

Two decimals; integers when exact.

Where is progress stored?

Only in local localStorage, never uploaded; full backup/restore is available.

LEARNING GAME

Statistics: 1000 Gamified Mean and Variance Cards

Turn statistics into level cards: read the data, compute mean/median/variance, then reveal; 20 cards per level. Variance uses the population formula (divide by n).

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Progress is stored locally in localStorage and is lost if you clear storage. Reviews use 1/3/7/14/30/60/120-day intervals.