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Cambridge IGCSE Statistics practice

What does seasonal variation in data represent?

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MCQ

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cambridge_mcq

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Topic

Time series

Exam-style question

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What does seasonal variation in data represent?.

  1. A.A long-term increase or decrease in data values
  2. B.Random fluctuations with no pattern
  3. C.Regular patterns that repeat within a year
  4. D.Sudden unexpected changes in data

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Paper 1 structured question: Time series

Paper 1Statistical Techniques6 marks

Data Table

Monthly Sales Data (in units)

Sales data for 12 months

MonthSales
Jan120
Feb130
Mar150
Apr170
May200
Jun220
Jul210
Aug190
Sep160
Oct140
Nov130
Dec110
  1. a

    Calculate the 3-month moving average for April.

    Aim for approximately 2 distinct marking points.

    [2]
  2. b

    Determine the seasonal component for July using the moving average method.

    Aim for approximately 4 distinct marking points.

    [4]