Discussion
A researcher has prepared a list of patients and selected samples on random basis is called ............... .
Answer: C
The key's answer is Sequential random sampling.
The researcher starts from a list of patients, a sampling frame, and draws the sample from it on a random basis, so the method must be a random one that works through a prepared list.
The others do not fit. Stratified sampling first divides the population into strata such as age or sex, which the question does not mention. Snowball sampling finds new subjects through referrals from existing ones, and quota sampling fills fixed quotas by the researcher's choice; both are non-random.
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