Which of the statements is NOT true regarding the advantages and disadvantages of stratified random sampling?
A. One advantage is that when used properly, it provides more precise estimates than simple random samples of the same size.
B. One advantage is that it reduces variability by creating similar subgroups from which estimates can be obtained.
C. One advantage is that it makes the process of selecting a sample easier when the population is very large.
D. One disadvantage is that having knowledge of the population is needed.