Do I need an account to practise Lines of best fit?

No. You can start practising Lines of best fit straight away without an account. A free account keeps your results across sessions, so you can see your progress on this topic over time.

Scatter graphs and correlation

Lines of best fit

41 self-marking GCSE and IGCSE practice questions on Lines of best fit, written specifically for AQA, Pearson, OCR, Cambridge IGCSE Mathematics (0580), Cambridge IGCSE (9-1) Mathematics (0980) across Foundation and Higher and Core and Extended tier. Instant marking with full worked solutions on every question.

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Sample Lines of best fit questions

A few of the 41 questions, from easier to harder. Choose your exam board and tier to practise them, with every answer marked.

Question 11 markGrade 3
A scatter diagram plots the ages (2 to 9 years) and heights (85 to 127 cm) of 10 girls, with a line of best fit drawn. Explain why the scatter diagram and line of best fit should not be used to estimate the height of a 12-year-old girl.

What are the common mistakes in Lines of best fit?

When a pupil makes one of these on Revision Workshop, the marking engine names the mistake and explains it, instead of just marking the answer wrong.

Joins the data points directly instead of drawing a straight line of best fit through the overall trend
Drew a jagged line connecting individual points instead of a single straight line following the overall trend
Confuses interpolation (within the data range) with extrapolation (beyond it)
Confused interpolation and extrapolation, labelling the estimate as extrapolation instead of interpolation
Substitutes incorrectly into the equation of a line of best fit
Added the gradient and x-value instead of multiplying them before adding the intercept

Quick answers about Lines of best fit

How many Lines of best fit practice questions are there?: There are 41 self-marking GCSE and IGCSE Maths questions on Lines of best fit, written for AQA, Pearson, OCR, Cambridge IGCSE Mathematics (0580), Cambridge IGCSE (9-1) Mathematics (0980) across Foundation and Higher and Core and Extended tier. Each one is marked instantly and has a full worked solution.
Do I need an account to practise Lines of best fit?: No. You can start practising Lines of best fit straight away without an account. A free account keeps your results across sessions, so you can see your progress on this topic over time.