Q27 · 2024 · Paper 1Unclassified2 marks
QUESTION 27 (2 marks)
M n ×
To determine the reliability of the capture–recapture technique and the Lincoln index
, N m
two researchers collected data on a mouse population from the same site at the same time.
Researcher | Number of mice in first capture | Number of mice in second capture | Number of marked mice in second capture |
I | 160 | 140 | 80 |
II | 100 | 60 | ? |
If the reliability of the technique is high, how many marked mice would be expected in the second capture for researcher II? Show your working.
WORKED SOLUTION
2 marksQCAA guide · typeset solution
QCAA sample response and mark allocation
27 | (researcher I)160 14080280MnNm×=×==10060280(researcher II)1006028021 micemm×=×== | • calculates N for researcher I [1 mark] • determines expected m for researcher II [1 mark] |
QCAA sample response and marking criteria reproduced from the official guide.
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