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Scatter graphs
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EasyQuestion 1
[2 marks]Describe the correlation shown by a scatter graph where:
- As temperature increases, ice cream sales increase
- The points are close to a straight line
Solution for Question 1
MediumQuestion 2
[3 marks]A line of best fit on a scatter graph has equation y = 2x + 5.
The x values in the data range from 10 to 50.
(a) Estimate y when x = 30.
(b) Explain why using the line to predict y when x = 100 may be unreliable.
Solution for Question 2
HardQuestion 3
[4 marks]A study finds strong positive correlation between hours of TV watched and exam grades.
A newspaper headline claims: "Watching TV improves exam results!"
(a) Explain why this claim may be incorrect.
(b) Suggest an alternative explanation for the correlation.
Solution for Question 3
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Generate Unlimited QuestionsAbout Scatter graphs in AQA GCSE
Scatter graphs show the relationship between two variables by plotting paired data as points. The pattern reveals correlation: positive (both variables increase together), negative (one increases as the other decreases), or no correlation (no clear pattern).
Correlation can be strong (points close to a line) or weak (points more scattered). Correlation does NOT prove causation - two things may be linked without one causing the other.
A line of best fit passes through the data showing the general trend. It should have roughly equal numbers of points above and below. Use it to estimate values within the data range (interpolation), but be cautious about extrapolating beyond the data.
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