Year 8 · Mathematics and statistics · Statistics
Statistical investigations, outliers and skew
Planning investigations and surveys, variable types, mean, median, mode and range, outliers, skewed and symmetric data, drawing and reading dot plots, stacked, clustered and time-series graphs, and spotting misleading graphs.
Everything for this topic in one place
- 3D lesson: Statistical investigations, outliers and skew — Island expedition: pose a statistical question, sort variable types, drop shells onto a 3D dot plot, balance it at the mean, watch an outlier drag the mean, spot skew and tails, and catch a misleading graph.
- Teacher presentation — slides to put on the projector.
- Worksheets at three levels — Tūī (support), Kererū (core) and Kea (extension), each with an answer key on the last page.
- Online practice — assign it to your class in the Crateclass classroom and the results come back by themselves.
Written for Te Mātaiaho, Phase 3 (Years 7–8), with New Zealand places, money and native birds.
Try before you sign up
See a full 3D lesson, a game and printable worksheets with no account on the free samples page. Teachers who sign up by 18 December 2026 get everything free until 9 April 2027.
More Year 8 maths topics
Powers of 10 and negative exponents · Prime factors, square and cube roots · Negative numbers and order of operations · Multiplying fractions and fractions of amounts · Percentages and ratio · Budgets, discounts and finance plans · Linear equations and inequalities · Expanding, simplifying and factorising · Triangular, square and cube number patterns · Area, volume and unit conversions · Angles with parallel lines and circles · Transformations, enlargement and map scales · Tree diagrams and probability experiments