Cambridge IGCSE Statistics practice

Paper 1 structured question: Time series

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Paper

Marks

Topic

Time series

Exam-style question

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Paper 1Statistical Techniques5 marks

A retailer tracks quarterly sales over two years and notices seasonal patterns.

Diagram Description

The graph shows sales peaks in Q4 and dips in Q2 for both years.

a
Describe the seasonal variation shown in the graph.
Your answer
Aim for approximately 2 distinct marking points.
[2]
b
Suggest how the retailer could use moving averages to find seasonal components.
Your answer
Aim for approximately 3 distinct marking points.
[3]

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Paper 1Statistical Techniques6 marks

Data Table

Sales data for 12 months

a
Calculate the 3-month moving average for April.
Your answer
Aim for approximately 2 distinct marking points.
[2]
b
Determine the seasonal component for July using the moving average method.
Your answer
Aim for approximately 4 distinct marking points.
[4]