Suppose a university wants to know how its students feel about parking on campus

Question

Suppose a university wants to know how its students feel about parking on campus. The administration suspects that students who reside on campus might have very different opinions from students who commute daily. Which of the following is not an advantage to using a stratified sample?

Choose the correct answer below.

A.

Stratified sampling has the advantage of not requiring a frame which lists all students and can be completed for a lower cost as a result.

B.

Stratified sampling could reduce the variability in the results, since each group of students would be more homogeneous.

C.

Stratified sampling could allow the university to survey fewer students and still obtain enough information.

D.

Stratified sampling could reduce bias by ensuring that both groups of students are represented proportionately.

Explanation / Answer

In case of stratified sampling, a sample that is drawn from a number of separate strata of the population, rather than at random from the whole population, in order that it should be representative.

Therefore statement B is an advantage because Stratified sampling could reduce the variability in the results, since each group of students would be more homogeneous.

Also statement 3 is true for any kind of sampling where Stratified sampling could allow the university to survey fewer students and still obtain enough information. This is also an advantage

Statement D. Stratified sampling could reduce bias by ensuring that both groups of students are represented proportionately. This is also an advantage of stratified sampling.

Therefore A is the correct answer here.

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