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Learning objective

Acknowledge that certain sampling techniques may introduce bias, such as selecting the first 10 individuals arriving at school for a transport survey.

Read the explanation, check the common trap, then practise with flashcards and questions.

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  • Read the explanation.
  • Check key terms.
  • Practise with linked questions.
Cambridge IGCSE StatisticsData and its collection

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Quick explanation

Acknowledge that certain sampling techniques may introduce bias, such as selecting the first 10 individuals arriving at school for a transport survey

  • This point belongs to Data and its collection, especially Data and its collection outcomes.
  • You need to be able to acknowledge that certain sampling techniques may introduce bias, such as selecting the first 10 individuals arriving at school for a transport survey.
  • The key ideas to know are Comment and Explain.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

CommentExplain

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Paper 1 structured question: Data and its collection

Paper 1Statistical Techniques2 marks

Description

Transport Survey Sampling

A survey is conducted to understand the transport preferences of students at a school. The first 10 students arriving at school are selected for the survey.

  1. a

    Comment on the potential bias introduced by this sampling method.

    Aim for approximately 2 distinct marking points.

    [2]
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