Match the following.
| List-I | List-II |
| a. Application of weights | 1. Medical research |
| b. Blocking | 2. Survey sampling |
| c. Sampling used to gather information about population | 3. Sample design |
| d. To guide practice | 4. Probability theory |
A. a-1, b-2, c-3, d-4
B. a-2, b-3, c-1, d-4
C. a-2, b-4, c-1, d-3
D. a-3, b-2, c-4, d-1
Answer: Option C

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