Latest updates

SL Spearman's Rank7 August 2019

For data that is non-linear, contains extreme values/outliers or in which we want to compare the ranks of one thing e.g. people's favourite chocolate in different countries, rather than pure numerical... more

Spearman's Rank Correlation Coefficient (rS)free7 August 2019

The following exam style questions aim to give you an idea of what you can expect for this topic in your exams. You can print the page by choosing 'print this page' from the menu on the rgiht OR you can... more

Spearman's Coefficient - practice free7 August 2019

The following practice questions are focused on checking, and developing, your understanding of the key ideas on this topic. You can print the page by choosing 'print this page' from the menu on the right... more

Pearson's (r) Limitationsfree7 August 2019

This activity explores two limits of the Pearson's product-moment correlation coefficient (PPMCC), r : The teaching slides are at the bottom of the page as it's important students explore the applets... more

Chi Squared Goodness of fit29 July 2019

This page is a brief guide to the Chi Squared goodness of fit test which is a new addition for the Applications course. It is included because of its use in the biology course and so this... more

Pearson's Correlation Coefficient23 July 2019

This activity is an example of where I would envisage teaching the same material, slightly differently, with an HL only or HL/SL level 5+ class than with a purely SL or SL Low level 5 and below classes.... more

Covariance 23 July 2019

This activity provides an intuitive insight into the concepts and techniques/calculations mathematicians used to solve the problem of "measuring" the differences in correlation. In particular, those that... more

Scattertastic22 July 2019

'Use the power of these virtual manipulatives to play with the ideas behind scattergraphs, correlation and lines of best fit.'The study of statistics at school is a great opportunity to show mathematics... more

SL Investment Intuition - Simulations19 July 2019

Investment 1Use "ZOOM" options in your internet browser if you can't see the whole applet (top of y-axes to the bottom) on one screen.Click on the "PLAY" button , BOTTOM LEFT, to start the animation and... more

SL Investment Intuition - Compounding19 July 2019

Sometimes our intuition/gut feeling for numbers can lead us astray.What's the best way your parents could help to make your life easier? I'm sure you can think of many ways. . ! One way would be to invest... more