An introduction to the normal distribution:

How to use the GDC for the normal distribution:

An introduction to correlation:

An explanation about Pearson’s Product Moment (r values:)

A worked exam question on bi variate data – how to plot scatter diagrams, find means and regression lines:

How to find Chi squared values – a past paper example:

A fantastic general revision video which covers one variable statistics, two variable statistics and also Chi squared: