Presentation and activity showing learners how the CLT works and how it can be used to produce confidence intervals. The initial activity demonstrates how plotting the students samples produces a normal distribution.Instructions,1. Students collect samples of a given size2. Teacher uses powerpoint to plot students results and discusses results3. Repeat with bigger sample to show how the results cluster round the mean.SMART Notebook Express presentations can be used for free by using SMART online or by downloading SMART software, also free, I use it because it allows a more interactive presentation than a powerpoint. Just search 'SMART Notebook Express' and try it with my free SMART resource.