Question

A study is conducted among first year undergraduate students in a US College of Nursing. From a list of these students, every 10th student is selected for an interview. Which of the following sampling strategies is being used?

a) Simple random sampling

b) Systematic sampling

c) Stratified random sampling

d) Cluster sampling

2. A study is conducted among first year nursing students in a US College of Nursing. Students are first grouped according to the state in which they lived before coming to the college. Ten states are then selected at random, and all students from those states are invited to participate in the study. Which of the following sampling strategies is being used?

a) Simple random sampling

b) Systematic sampling

c) Stratified random sampling

d) Cluster sampling

3. A survey is to be administered to the nursing students who are graduating from Wells College this semester. To select our sample, we entered the student ID numbers of all students who are graduating this semester into the computer and let the computer randomly select 50 students. Which of the following sampling strategies is being used?

a) Simple random sampling

b) Systematic sampling

c) Stratified random sampling

d) Cluster sampling

Answer 1

1. b) Systematic sampling

Systematic sampling is a technique for creating a random probability sample in which each piece of data is chosen at a fixed interval for inclusion in the sample.

In the given question, every 10th student is chosen for the interview. Hence systematic sampling is used.

2 . d) Cluster Sampling

In Cluster sampling the total population is divided into groups and a simple random sample of the groups is selected.

Here students were first grouped according to the state in which they lived before coming to the college and then ten states were selected at random, and all students from those states were invited to participate in the study. Hence cluster sampling is used.

3. c) Simple Random sampling

In simple random sampling, each individual is chosen randomly and entirely by chance, such that each individual has the same probability of being chosen at any stage during the sampling process.

Here on the basis of ID numbers, 50 students were randomly chosen. Hence simple random sampling is used.