Executive leadership wants to survey employees at a grocery store that is open 24 hours a day. They are interested in getting surveys from people from every job title (cashier, stocker, manager, etc.) Which of the following uses systematic random sampling?
Answer
A
Survey 3 randomly chosen cashiers, then repeat that process with the stockers, managers, etc.
B
Randomly select 1 of the 3 shifts (morning, afternoon, or night), and survey all the employees who work that shift.
C
List all of the employees by their employee ID number. Have the computer randomly select 25 of the numbers, and survey those employees.
D
List all of the employees by their employee ID number. Survey the 11th person on the list (with the number 11 being randomly chosen), then survey every 10th person on the list after that.
Explanation
Systematic random sampling starts at a randomly chosen position in an ordered list, then selects people at a fixed interval. In A, the starting position is randomly chosen as 11, and every 10th employee after that is surveyed. B is simple random sampling, C is cluster sampling by shift, and D is stratified sampling by job title.
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