an interesting use of ratios is in the 'capture-recapture' method for estimating a population size

pull out a sample

mark it in some way

put the sample back

pull out another sample and use the fraction/ratio of marked things to estimate the full population size

suppose 40 butterflies are marked in some way and released in a particular location

then a further 20 are captured as shown:

how many butterflies would you estimate there to be from this information?

this program enables repeated capturing

repeatedly making second captures enables a comparison of different estimates, exploring the variation:

what are the extremes and what is the mean?

## No comments:

## Post a Comment

Note: only a member of this blog may post a comment.