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SSC Selection Post 2023 PYQ — Question 45

SSC Selection Post - Matriculation Level - 30 June 2023 - Shift 4 • General Awareness • Q45

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What does the Lincoln index measure?

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Correct answer: A

Explanation

The correct answer is option 1 i.e. Population Size.

 

The Lincoln Index, also known as the Lincoln-Petersen Index, is a mathematical method used in ecology to estimate the population size of animals (especially wildlife) in a given area. It is commonly applied in mark and recapture studies.

How It Works:

  1. A certain number of animals are captured, marked, and then released.

  2. After some time, another sample is captured.

  3. The proportion of marked to unmarked individuals in the second sample helps estimate the total population size.

Formula:

Estimated Population Size (N) = n1×n2m\frac{n_1 \times n_2}{m}

Where:

  • n₁ = Number of individuals initially marked

  • n₂ = Number captured in second sample

  • m = Number of marked individuals in second sample