Multiple choice

Which of the following is not used to determine the size of a population?

  1. Direct observation

  2. Sampling

  3. Mark and recapture

  4. Guesstimate

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Direct observation, sampling, and mark-and-recapture are all standard scientific methods for estimating population size. A 'guesstimate' is an informal term and not a scientific method.