The scatter graph shows information about the volume of traffic and the carbon monoxide level at a point on a road each day for 22 days - Edexcel - GCSE Maths - Question 2 - 2021 - Paper 3
Question 2
The scatter graph shows information about the volume of traffic and the carbon monoxide level at a point on a road each day for 22 days.
One point is an outlier.
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Worked Solution & Example Answer:The scatter graph shows information about the volume of traffic and the carbon monoxide level at a point on a road each day for 22 days - Edexcel - GCSE Maths - Question 2 - 2021 - Paper 3
Step 1
Write down the coordinates of this point.
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Answer
The coordinates of the outlier are (130, 20).
Step 2
Estimate the carbon monoxide level for this day.
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Answer
For the day with 370 cars, the estimated carbon monoxide level is approximately 12.8 mg/m³.
Step 3
Is Alfie correct? You must give a reason for your answer.
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Answer
No, Alfie is not correct. Outliers can affect the general trend, but the overall correlation can still be identified. In this case, there is a positive correlation between traffic volume and carbon monoxide levels.
