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Variance and standard deviation : Statistics: Alternate Variance F...

By: Sal Khan

Playing with the formula for variance of a population.

Measures of central tendency and dispersion. Mean, median, mode, variance, and standard deviation.

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Variance and standard deviation : Simulation providing evidence th...

By: Sal Khan

Simulation by KA user tetef showing that dividing by (n-1) gives us an unbiased estimate of population variance.

Measures of central tendency and dispersion. Mean, median, mode, variance, and standard deviation.

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Linear regression and correlation : Calculating R-Squared

By: Sal Khan

Calculating R-Squared to see how well a regression line fits data

Fitting a line to points. Linear regression. R-squared.

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Sal's old statistics videos : Statistics: Sample Variance

By: Sal Khan

Using the variance of a sample to estimate the variance of a population

Measures of central tendency and dispersion. Mean, median, mode, variance, and standard deviation.

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Brain Teasers : Liar Truth-teller Brain Teaser

By: Sal Khan

How to get correct advice when you can only ask one question from either a liar or a truth-teller (when you don't know who is what)

Random logic puzzles and brain teasers. Fun to do and useful for many job interviews!

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