GCSE · Scatter graphs & correlation

Predicting from a line of best fitExam-style questions

How to read an estimate off a line of best fit in both directions, why a prediction inside the data is trustworthy and one outside it is not, and what the gradient of the line means in the context of the question.

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10 questions · GCSE (Higher) level · mark scheme and worked solution on each · no sign-up to try

DifficultyAll Level 1 Level 2 Level 3 Level 4 Level 5

1
The scatter graph shows the hours students revised and their test scores, with a line of best fit.Use the line of best fit to estimate the score of a student who revised for $4.5$ hours.
Level 1 · 1 markTry it
2
The scatter graph shows the hours students revised and their test scores, with a line of best fit.Explain why the line should not be used to estimate the score of a student who revised for $20$ hours.
Level 1 · 1 markTry it