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Cambridge IGCSE Statistics practice

Paper 1 structured question: Transformations of data sets

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Transformations of data sets

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Paper 1Statistical Techniques3 marks

Effects of scaling on statistical measures.

Description

Dataset Scaling

Consider a dataset where each data point is multiplied by 3.

  1. a

    Calculate the new median if the original median was 10.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Explain how the interquartile range is affected.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 1 structured question: Transformations of data sets

Paper 1Statistical Techniques3 marks

Description

Dataset Transformation

Consider a dataset where each data point is increased by 7.

  1. a

    Calculate the new median if the original median was 15.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Explain why the interquartile range remains unchanged.

    Aim for approximately 2 distinct marking points.

    [2]