A local high school has 300 students in each grade. In order to conduct a survey

Question

A local high school has 300 students in each grade. In order to conduct a survey of the 1200 students on their study habits researchers need a sample of 80 students. Rather than choose a simple random sample of 80 of the 1200 students, the researchers decide to choose a simple random sample of 20 students from each grade and combine these four simple random samples to form their sample. Answer the following questions in the text box provided. a. What is the name of the sampling technique described above? b. Why might the researchers choose to use the sampling technique described above rather than just using a simple random sample of 80 of the 1200 students?

Explanation / Answer

a) Stratified sampling refers to a type of samplingmethod . With stratified sampling, the researcher divides the population into separate groups, called strata. Then, a probability sample (often a simple random sample ) is drawn from each group.Stratified sampling has several advantages over simple random sampling.

b) Stratified random sampling is also advantageous when it can be used accurately because it ensures each subgroup within the population receives proper representation within the sample.

The principal reasons for using stratified random sampling rather than simple random sampling include:

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.