Capture/recapture sampling method

Quiz by Oak National Academy: GCSE Maths Higher (2)

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6 questions

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Q1
__________ is a sampling method which allows you to estimate the size of a population without counting it fully.
Capture-recapture
Recapture
Stratified
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Capture
30s
Q2
Izzy captures 10 hedgehogs and marks each one with a paper band around its leg. Izzy then recaptures 10 hedgehogs, but finds that none of them have a paper band. Select the possible reasons for this.
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Sorting
30s
Q3
To estimate the population of birds in a wood, 5 birds are captured from a single tree and marked. 9 months later, in a recapture of 10 birds, 0 were marked. Which factors may effect the results?
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Sorting
30s
Q4
As part of a capture-recapture sample, 100 fish from a lake are captured and marked with a white dye. During a recapture of 50 fish, 5 were marked with the white dye. Select the correct statement.
$\frac{50}{100}=\frac{5}{x}$
$\frac{50}{100}=\frac{x}{5}$
$\frac{100}{x}=\frac{50}{5}$
$\frac{100}{x}=\frac{5}{50}$
$\frac{x}{100}=\frac{5}{50}$
30s
Q5
Andeep captures 15 deer and marks them by attaching a tag to their legs. Three days later, Andeep recaptures 30 deer, and 3 of them have a tag attached. Estimate the total number of deer.
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30s
Q6
Jun captures 45 squirrels and marks them by attaching a tag to their legs. Three days later, Jun recaptures 70 squirrels, and 15 of them have a tag attached. Estimate the total number of squirrels.
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Type an Answer
30s

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