ExpertMedium2 marksMultiple Choice
ACCA · Question 07 · Data Analysis and Statistical Techniques
A market research service firm is conducting a survey on consumer habits. They divide the population into distinct age groups and then randomly select individuals from each group in proportion to the group's size in the overall population.
Which TWO statements about this sampling method are correct?
A market research service firm is conducting a survey on consumer habits. They divide the population into distinct age groups and then randomly select individuals from each group in proportion to the group's size in the overall population.
Which TWO statements about this sampling method are correct?
Answer options:
A.
It is an example of quota sampling.
B.
It is an example of stratified sampling.
C.
It requires a sampling frame.
D.
It is a non-probability sampling method.
How to approach this question
Identify the sampling method described (stratified). Recall the characteristics of stratified sampling, including its need for a sampling frame.
Full Answer
The method described is stratified sampling, where the population is divided into strata (age groups) and a random sample is taken from each. Because it relies on random selection, it is a probability sampling method and requires a sampling frame (a list of all items in the population).
Common mistakes
Confusing stratified sampling with quota sampling. Quota sampling does not use random selection within the groups.
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