Khan Academy

Unbiased estimate of population variance (K-A)

Means and medians of different distributions (K-A)

Why we divide by n – 1 in variance (K-A)

Median & range puzzlers (K-A)

Mean absolute deviation (MAD) (K-A)

Missing value given the mean (K-A)

Mean absolute deviation (MAD) review (K-A)

Mean absolute deviation example (K-A)

Range and mid-range (K-A)

Population and sample standard deviation review (K-A)

Sample standard deviation and bias (K-A)

Sample variance (K-A)

Calculating standard deviation step by step (K-A)

Concept check: Standard deviation (K-A)

Mean and standard deviation versus median and IQR (K-A)

Measures of spread: range, variance & standard deviation (K-A)

Population standard deviation (K-A)

Statistics: Alternate variance formulas (K-A)

The idea of spread and standard deviation (K-A)

Variance of a population (K-A)

Density curve worked example (K-A)

Density Curves-video (K-A)

Median, mean and skew from density curves (K-A)

Worked example finding area under density curves (K-A)

How parameters change as data is shifted and scaled (K-A)