- A company director decides to survey staff about changes to the company calendar. The company has staff in 4 different job roles
72 managers, 108 drivers, 180 administrators and 360 warehouse staff.
The director decides to take a stratified sample.
- Write down one advantage of using a stratified sample rather than a simple random sample for this survey.
- Find the number of staff in each job role that will be included in a stratified sample of 40 staff.
- Describe how to choose managers for the stratified sample.