Sample types *HARD* (copelin)

Question 1

How do you do a simple random sample?

Answer 1

• Each member of the population has an equal chance of being picked
• Names in a hat
• Random number generator

Question 2

What is a cluster sample?

Answer 2

• The population is divided into groups (clusters)
• Some of the clusters are selected using a simple random sample
• All the members of the selected clusters are sampled

Question 3

What is a systematic sample?

Answer 3

• The population is in an ordered list
• The size of the population is divided by the size of the sample required to give the sampling interval
• A starting point is randomly chosen and then we skip ahead in step sizes equal to the sampling interval

Question 4

What is a stratified sample?

Answer 4

• The population is split into groups of the same characteristics (strata)
• The number of members to be selected from each strata is proportional to its size
• Those members are then selected using a simple random sample

Question 5

What is a quota sample?

Answer 5

• The population is split into strata (as in stratified sampling)
• A desired number of members from each strata is decided upon
• The interviewer conducts the survey enough times until these desired quotes have been reached