Correct option is D
(A) Sampling Frame → (I)
A sampling frame is a list or database from which a sample is drawn.
It contains all the population elements that are available for sampling. It ensures accuracy and inclusiveness during the selection of the sample.
An incomplete or outdated sampling frame may cause coverage error.
(B) Sample Unit → (IV)
A sample unit is the smallest individual unit eligible for selection in a sampling process.
It is a single member of the sample, such as one student, one household, or one voter.
Proper identification of sample units ensures clarity and consistency in sampling.
(C) Sampling Error → (II)
Sampling error is the difference between sample results and true population parameters.
It occurs when the selected sample does not accurately represent the entire population’s characteristics. It is a natural part of sampling.
Larger sample sizes and better sampling techniques reduce sampling error.
(D) Sample → (III)
A sample is a subset of a population selected for study.
It contains some elements of the population and is used to make inferences about the whole.
If well-chosen, a sample provides reliable results at a lower cost and time than a full population study.
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