This statistics video tutorial explains how to calculate the variance of a sample. Statistics - Free Formula Sheet: Statistics - Video Lessons: ________________________________ Introduction to Statistics: Arithmetic, Geometric, & Harmonic Mean: Cumulative Relative Frequency Table: Quartiles, Deciles, & Percentiles: Interquartile Range & Outliers: ___________________________________ Skewness & Symmetric Distribution: Sample Mean and Population Mean: Mean, Median, & Mode - Grouped Data: Standard Deviation: Variance: ___________________________________ Mean Absolute Deviation: Standard Deviation of Grouped Data: Introduction to Probability: Probability Formulas: Final Exams and Video Playlists: