Mathematics for IGCSE & O level - Categorical, Numerical And Grouped Data (Section 6 - No. 45)
Which of the following would be a method to ensure a fair and representative sample in a school survey?
Surveying only the students in the cafeteria.
Surveying only the students who show up to school.
Randomly sampling from all students
Surveying only students in advanced courses.
Forklaring
Random sampling from all students ensures a representative sample.