Cambridge IGCSE Statistics practice

Paper 1 structured question: Transformations of data sets

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Paper

Marks

Topic

Transformations of data sets

Exam-style question

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Paper 1Statistical Techniques3 marks

Understanding the effects of transformations on statistical measures.

Description

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

a
Calculate the new median if the original median was 15.
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
Explain why the interquartile range remains unchanged.
Your answer
Aim for approximately 2 distinct marking points.
[2]

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Paper 1Statistical Techniques3 marks

Description

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

a
Calculate the new median if the original median was 10.
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
Explain how the interquartile range is affected.
Your answer
Aim for approximately 2 distinct marking points.
[2]