This lesson contains a worked example followed by a series of exercises where the students can practice and apply their knowledge. Included within the PowerPoint are worksheets for the students to fill in and a full set of answers, including worked calculations. I have included two dispersion diagrams to be used to calculate the interquartile range. I designed these to be used either as homework tasks or as an introductory lesson / skill practice lesson. They are also designed to encourage the students to memorise the formulae as these will not be included in the exam papers even at GCSE level.
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