Khan Academy

Sample standard deviation and bias (K-A)

Shapes of distributions (K-A)

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

Density curve worked example (K-A)

Density Curves (K-A)

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

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

Comparing with z-scores (K-A)

Normal distribution problem: z-scores (from ck12.org) (K-A)

Normal distribution problems: Empirical rule (from ck12.org) (K-A)

Qualitative sense of normal distributions (from ck12.org) (K-A)

Standard normal table for proportion above (K-A)

Standard normal table for proportion below (K-A)

Correlation and causality (K-A)

Standard normal table for proportion between values (K-A)

Observational studies and experiments-notes (K-A)

Types of statistical studies-video (K-A)

Worked example identifying experiment-video (K-A)

Worked example identifying observational study-video (K-A)

Worked example identifying sample study (K-A)

Identifying a sample and population (K-A)

Reasonable samples (K-A)

Techniques for generating a simple random sample (K-A)

Central limit theorem (K-A)

Inferring population mean from sample mean (K-A)