Biostatistics: practice question

A PSM question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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PSM · Biostatistics

Sample item

A survey wants to assess immunisation status in a large district where a complete list of children is unavailable. Which sampling method is the most practical?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

C. Cluster sampling

Cluster sampling selects groups, such as villages or wards, at random, then surveys individuals within them. It does not need a full sampling frame of individuals and reduces travel, as in standard immunisation coverage surveys, although the design effect increases the sample size needed.

Option by option

  • A. Simple random sampling

    Simple random sampling requires a complete list of all children.

  • B. Systematic sampling from a register

    Systematic sampling also needs a sampling frame such as a register.

  • C. Cluster sampling (correct)

    Correct. It needs only a list of clusters, not of all individuals.

  • D. Quota sampling

    Quota sampling is non-random and introduces selection bias.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

More PSM questions

Questions about this PSM question

What is the answer to this PSM question?

The best answer is C, Cluster sampling. Cluster sampling selects groups, such as villages or wards, at random, then surveys individuals within them.

Why is "Simple random sampling" not the answer?

Simple random sampling requires a complete list of all children.

Why is "Systematic sampling from a register" not the answer?

Systematic sampling also needs a sampling frame such as a register.

Why is "Quota sampling" not the answer?

Quota sampling is non-random and introduces selection bias.

What concept does this question test?

It tests Biostatistics in PSM. It does not need a full sampling frame of individuals and reduces travel, as in standard immunisation coverage surveys, although the design effect increases the sample size needed.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Biostatistics?

Practise biostatistics with small calculations until sensitivity, predictive values and risk measures are automatic. Then use the flashcards and the other PSM questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.