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Cambridge IGCSE Statistics practice

Paper 1 structured question: Data and its collection

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Data and its collection

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Paper 1Statistical Techniques1 marks

A school wants to survey student opinions on a new cafeteria menu.

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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Paper 1 structured question: Data and its collection

Paper 1Statistical Techniques2 marks

Data Table

Classroom Data

The researcher has data from 5 classrooms, each with different numbers of students. The classrooms are divided into two groups based on their performance: high and low achievers.

ClassroomNumber of StudentsGroup
Class A30High
Class B25Low
Class C28High
Class D32Low
Class E20High
  1. a

    Comment On the representativeness of a sample taken from these classrooms if 10 students are randomly selected from each group.

    Aim for approximately 2 distinct marking points.

    [2]