CAIE A-Level Biology A2 Formula Reference Lincoln Index and Simpson Diversity Questions

Use the supplied Lincoln and Simpson’s index formulae to turn capture–recapture counts into population estimates and species counts into diversity values.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

Exam points

  • Calculate Simpson’s diversity index by squaring species proportions and subtracting their sum from 1
  • Estimate population size with the Lincoln index using capture totals and marked recaptures

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