Learn about range, variance, and standard deviation as measures of dispersion in statistics.

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Sal explains a different variance formula and why it works! For a population, the variance is calculated as σ² = ( Σ (x-μ)² ) / N. Another equivalent formula is σ² = ( (Σ x²) / N ) - μ².

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Khan Academy propose des vidéos éducatives et des exercices interactifs pour apprendre les statistiques et la probabilité, y compris l'analyse de la variance (ANOVA).

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