Following on from the previous tutorial on how to smooth time series data, this video runs through an example question covering all the steps to do with smoothing and using smoothed trend lines to make predictions. The question comes from the MathsWorld further mathematics textbook published by MacMillian (2005). Speaking of that textbook, it is [...]

Today’s tutorial is all about smoothing time series data. Learn how to smooth data using 3 point and 5 point smoothing, using either means or medians. I’ll show you how to apply median smoothing straight on to the graph. I’ll also run through smoothing with an even number of points (such as 4 point moving [...]

Now that you know all about how to represent data — in histograms, dot plots, bar charts, stem plots, and box plots — we can look at how to describe and compare them. This tutorial will cover how to describe distributions in terms of their shape, centre and spread, and whether there are any outliers [...]

Summary statistics is a fairly big and rather important topic, so I’ve split this into four videos. Part 1 explains mean and mode, part 2 looks at calculating the median, part 3 covers range and interquartile range (IQR) and part four shows you how to calculate standard deviation and variance. [Update - I've put another [...]