Manufacturers were subdivided into groups by volume of sales. Those with more than $100 million in sales were classified as Class A large; those from $50 to $100 million as Class A medium size; and those between $25 and $50 million..., and so on. Samples were then selected from each of these groups. What is this type of sampling called?
A) Simple random
B) Stratified random
C) Cluster
D) Systematic
E) None of the choices are correct

Question

Quizplus · Accepted Answer

This is an example of stratified random sampling, where the population is divided into subgroups (strata) based on a characteristic (sales volume) and samples are taken from each subgroup.

Manufacturers Were Subdivided into Groups by Volume of Sales