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 Techniques2 marks

A company records monthly sales over two years and observes a steady upward trend with seasonal peaks every December.

Description

The sales data shows an increasing trend and a seasonal peak in December each year.

a
Calculate If the trend line predicts sales of 1000 units in November and the seasonal component for December is +200 units, calculate the forecasted sales for December.
Your answer
Aim for approximately 2 distinct marking points.
[2]

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Paper 1Statistical Techniques3 marks

Description

Trend increases by 50 units each quarter; seasonal index for Q3 is 1.2.

a
Predict If sales in the second quarter were 400 units, predict the sales for the third quarter using the trend and seasonal index.
Your answer
Aim for approximately 3 distinct marking points.
[3]