Which of the following statistical sampling methods would be most appropriate for this test?

An appliance repair company is considering relocating the center that houses its service vehicles. An internal auditor wants to determine the potential reduction in average miles driven by the service vehicles if the center is relocated.

Which of the following statistical sampling methods would be most appropriate for this test?
A . Attributes sampling.
B . Discovery sampling.
C . Probability-proportional-to-size sampling.
D . Mean-per-unit sampling.

Answer: D