Manufacturers were subdivided into groups by volume of sales. Those with more than $100 million in sales were classified as large; those from $50 to $100 million as 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 sampling
B)Stratified random sampling
C)Cluster sampling
D)Systematic sampling

Question

Quizplus · Accepted Answer

This is an example of stratified random sampling because the population (manufacturers) was subdivided into different groups (based on sales volume) and then samples were selected from each group.

Manufacturers Were Subdivided into Groups by Volume of Sales