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Correlation
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EasyQuestion 1
[2 marks]For each pair of variables, state whether you would expect positive correlation, negative correlation, or no correlation:
(a) Age and height of children
(b) Temperature and number of coats sold
Solution for Question 1
MediumQuestion 2
[3 marks]A scatter graph shows the relationship between hours of exercise per week and resting heart rate.
The graph shows points that slope downward from left to right, with most points close to a straight line.
Describe the correlation and suggest a reason for it.
Solution for Question 2
HardQuestion 3
[4 marks]Two variables have a correlation coefficient of -0.85.
(a) Describe the correlation between the variables.
(b) If the correlation coefficient was 0.15, how would your description change?
Solution for Question 3
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Generate Unlimited QuestionsAbout Correlation in AQA GCSE
Correlation describes the relationship between two variables. Positive correlation: as one increases, so does the other (e.g., height and shoe size). Negative correlation: as one increases, the other decreases (e.g., price and demand). No correlation: no clear relationship.
The strength of correlation ranges from weak (scattered points) to strong (points close to a line). A perfect correlation would have all points exactly on a line. In real data, some scatter is normal.
When describing correlation, state both the type (positive/negative/none) and strength (strong/moderate/weak). For example: "strong positive correlation" or "weak negative correlation".
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