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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 company recorded its monthly sales (in units) over 7 months as follows: 120, 130, 125, 140, 135, 150, 145.

Data Table

Monthly Sales Data

Sales units for 7 months

MonthSales (units)
1120
2130
3125
4140
5135
6150
7145
  1. a

    Calculate the 3-month moving averages for months 2 to 6.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 1 structured question: Time series

Paper 1Statistical Techniques2 marks

Description

Drawing a Trend Line

Using the moving average values, a trend line is drawn to show the general direction of sales over time.

  1. a

    Comment on the trend shown by the moving average trend line if the values increase from 125 to 143 over the months.

    Aim for approximately 2 distinct marking points.

    [2]