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Learning objective

Utilize a random number table to choose a simple random sample, systematic sample, or stratified sample, as defined by the problem, and determine if a sample is representative of specific strata.

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

Utilize a random number table to choose a simple random sample, systematic sample, or stratified sample, as defined by the problem, and determine if a sample is representative of specific strata

  • This point belongs to Data and its collection, especially Data and its collection outcomes.
  • You need to be able to utilize a random number table to choose a simple random sample, systematic sample, or stratified sample, as defined by the problem, and determine if a sample is representative of specific strata.
  • The key ideas to know are Show and Determine.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

ShowDetermine

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This objective helps connect Data and its collection outcomes to exam-style questions, flashcards, and revision notes for Data and its collection.

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Paper 1 structured question: Data and its collection

Paper 1Statistical Techniques1 marks

Description

Student Survey

The school has 400 students, divided into 4 grades: 100 in Grade 9, 100 in Grade 10, 100 in Grade 11, and 100 in Grade 12. The school decides to use stratified sampling to ensure each grade is represented.

GradeNumber of Students
Grade 9100
Grade 10100
Grade 11100
Grade 12100
  1. a

    Calculate How many students should be sampled from each grade if the school wants to survey 40 students in total?

    Aim for approximately 1 distinct marking point.

    [1]
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