A company has 480 day-shift production staff, 320 night-shift production staff, 240 office staff and 160 managers. It requires a proportional stratified sample of 75 employees.
Calculate the four allocations.
Explain how employees should be selected within each stratum.
Give one advantage of this design over surveying employees in the canteen at noon.
36 exam-style questions on OCR (MEI) A Level Maths 2.1 Sampling, covering 2.1.1 Population and sample, 2.1.2 Samples to make informal inferences, 2.1.3 Random sampling, 2.1.4 Variety of sampling techniques, 2.1.5 Select or evaluate sampling techniques, and 2.1 Sampling. Each one has a worked solution and a mark scheme showing where the marks go.