(i. The type of sampling when a population is first divided into subgroups and then a sample is selected from each subgroup is called stratified random sampling. (ii) Auditors may select every 20th file starting with say, the 5th file in the top drawer. Then file numbers 25, 45, 65, 85, are audited. This type of sampling is called cluster sampling.
(iii) The mean of a population is called a parameter.
A) (i), (ii), and (iii) are all correct statements.
B) (i) and (ii) are correct statements but not (iii).
C) (i) and (iii) are correct statements but not (ii).
D) (ii) and (iii) are correct statements but not (i).
E) (i), (ii), and (iii) are all false statements.

Question

Quizplus · Accepted Answer

(i) Stratified random sampling involves dividing a population into subgroups (strata) and then taking a sample from each of these groups. (ii) The described sampling method is systematic sampling, not cluster sampling. In cluster sampling, the population is divided into clusters, and a whole cluster is randomly selected for sampling, not individual elements at fixed intervals. (iii) The mean of a population is indeed called a parameter, which is a value that describes a characteristic of a population.

(I the Type of Sampling When a Population Is First