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.
Carbon monoxide level (mg/m... show full transcript
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
(a) Write down the coordinates of this point.
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Answer
The outlier can be identified as the point that does not follow the general trend of the other data points. From the graph, the coordinates of the outlier are (120, 20).
Step 2
(b) Estimate the carbon monoxide level for this day.
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Answer
To estimate the carbon monoxide level for 370 cars, refer to the graph where 370 is plotted along the x-axis. The estimated carbon monoxide level at this point appears to be approximately 12 mg/m³.
Step 3
(c) Is Alfie correct? You must give a reason for your answer.
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Answer
No, Alfie is not correct. While outliers can affect the correlation, they do not necessarily eliminate it. The correlation can still be positive or negative even in the presence of an outlier. The general trend of the other points still shows a pattern.
