A council employs 240 administrative staff, 180 parks staff and 80 waste-management staff. It takes a stratified random sample of 50 employees, using department as the stratum.
Calculate the number of employees to select from each department.
State how the employees should be selected within each department.
36 exam-style questions on CCEA A Level Maths 2.4 Statistical sampling, covering 2.4.1 Statistical sampling, 2.4.2 Statistical sampling, 2.4.3 Statistical sampling, and 2.4.4 Statistical sampling. Each one has a worked solution and a mark scheme showing where the marks go.