Question

A study conducted by researchers from the Department of Education wanted to know the average debt of college students in the United States. In order to obtain a sample representative of all students, the researchers divided college students into the four classes (freshman, sophomore, junior, and senior) and then took a random sample of students from each class. Which sampling method did they use?

A) Stratified random sampling
B) Systematic random sampling
C) Cluster sampling
D) Simple random sampling

Answer 1

Answer: A) Stratified random sampling

Explanation:

Since , the researchers divided college students into the four classes (freshman, sophomore, junior, and senior) and then took a random sample of students from each class.

That means each category is participating in the sample.

It means , they used stratified sampling method where each class denotes a strata.

• Stratified random sampling is a kind of random sampling technique in which the researcher divides the whole population into some finite number of groups also known as strata , the he randomly pick individuals from each strata to make a sample.

Here , each category participates in researcher's analysis.

Hence, the correct answer is A) Stratified random sampling .