Exam-Style Question on Correlation
A mathematics exam-style question with a worked solution that can be revealed gradually
Question id: 339. This question is similar to one that appeared on a GCSE Higher paper in 2017. The use of a calculator is not allowed.
The scatter graph shows the maximum temperature (oC) and the number of bowls of soup sold at a sandwich shop on twelve randomly selected days last year.
(a) One of the points is an outlier. What temperature does this outlier represent.
(b) For all the other points write down the type of correlation.
(c) On another day of the year, the temperature was 20oC. Estimate the number of bowls of soup sold on that day.
(d) The shop owner says "We sell more bowls of soup the higher the temperature". Does the scatter graph support this statement? Give a reason for your answer.
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If you need more practice try the self-checking interactive exercises called Correlation.
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