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 Techniques4 marks

A retailer records weekly sales over 6 weeks: 200, 220, 210, 230, 240, 250.

Data Table

Sales units for 6 weeks

a
Calculate the 2-point moving averages for weeks 1 to 5.
Your answer
Aim for approximately 2 distinct marking points.
[2]
b
Calculate the centred moving averages for weeks 2 to 5.
Your answer
Aim for approximately 2 distinct marking points.
[2]

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Paper 1Statistical Techniques3 marks

Data Table

Sales units for 7 months

a
Calculate the 3-point moving averages for months 2 to 6.
Your answer
Aim for approximately 3 distinct marking points.
[3]