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Advantages of Stratified Random Sampling

APSTAT-VKPQXQ

A school district has hired a new janitorial services company and the superintendent wants to inspect a random sample of classrooms in each of the district's eight schools in order to see how well the rooms are being cleaned. The superintendent has decided to conduct a stratified random sample where the eight different schools represent eight different strata. In this situation, what is an advantage to using stratified random sampling?

A

Inspecting classrooms identified from a stratified random sample would be easier and less costly than inspecting classrooms from a simple random sample.

B

By using a stratified random sample, classrooms in every building will be represented in the superintendent's assessment of the performance of the new janitorial services company.

C

By using stratified random sampling, the superintendent's assessment of the performance of the new janitorial services company will be less impacted by non-response bias.

D

Using stratified random sampling is the only way in which the superintendent can ensure that the classrooms that he inspects are part of his population of interest.

E

There is no advantage to using stratified random sampling. It is always better to use a simple random sample.