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Khan Academy
Khan Academy: Statistics: Alternate Variance Formulas
Video shows using algebra to manipulate the variance formula to arrive at alternate variance formulas. [12:17]
Khan Academy
Khan Academy: Statistics: Alternate Variance Formulas
Video shows using algebra to manipulate the variance formula to arrive at alternate variance formulas.
Khan Academy
Khan Academy: Variance and Standard Deviation: Variance of a Population
This video shows how to find a population mean from a set of data and the compute the population variance.
Khan Academy
Khan Academy: Variance and Standard Deviation: Sample Variance
This video shows how to estimate the variance of a population by looking at the data in a sample.
Khan Academy
Khan Academy: Statistics: Variance of a Population
Video first reviews sample and population mean and their notation. Gives example of how variance is a useful description of a set and shows how to calculate variance including notation. Includes link to practice problems. [12:23]