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Cambridge IGCSE Statistics practice

Paper 1 structured question: Time series

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Time series

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Paper 1Statistical Techniques3 marks

A retailer uses a trend line and seasonal indices to forecast quarterly sales. The trend shows a steady increase of 50 units per quarter. The seasonal index for the third quarter is 1.2.

Description

Quarterly Sales Forecasting

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

  1. a

    Predict If sales in the second quarter were 400 units, predict the sales for the third quarter using the trend and seasonal index.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 1 structured question: Time series

Paper 1Statistical Techniques2 marks

Description

Sales Data Overview

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

  1. 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.

    Aim for approximately 2 distinct marking points.

    [2]