Methods of samplingEdexcel International A Level Further Maths: Mind map

Exam questions on Methods of sampling

1. A college has 840 students, listed alphabetically on a register. The principal wants the views of 60 of them on a proposed new timetable.
   Describe how the principal could select the systematic sample of 60 students from the register.2 marks
2. A council has 500 houses, numbered 001 to 500. A researcher uses a calculator to generate three-digit random numbers, in this order: 417, 862, 093, 417, 250, 501, 338, and so on. She wants to choose a simple random sample of 40 houses.
   Explain why the numbers 862 and 501 are ignored, and why the second 417 is also ignored.2 marks
3. A company has 480 employees: 192 work in production, 168 in sales and 120 in administration. The managers expect views on a new working-hours policy to differ between the departments. A stratified sample of 40 employees is to be taken.
   Calculate the number of employees that should be sampled from each department.3 marks