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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 records monthly sales (in units) over 7 months: 120, 130, 125, 140, 135, 150, 145.

Data Table

Monthly Sales Data

Sales units for 7 months

MonthSales
1120
2130
3125
4140
5135
6150
7145
  1. a

    Calculate the 3-point 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 Techniques4 marks

Data Table

Weekly Sales Data

Sales units for 6 weeks

WeekSales
1200
2220
3210
4230
5240
6250
  1. a

    Calculate the 2-point moving averages for weeks 1 to 5.

    Aim for approximately 2 distinct marking points.

    [2]
  2. b

    Calculate the centred moving averages for weeks 2 to 5.

    Aim for approximately 2 distinct marking points.

    [2]