# aqa unit 4 ecologyy Watch

1. a garden has a large populations of ground beetles. describe an investigation to find out if the sizeof the population in the garden is signinficantly different from the size of the population of these beetles in a surrounding woodland.

i put that youd set up 2 traps, one in the garden and one in the woodland. use a random number generator to decide where to place the traps so to avoid bias.
then leave both traps for a day and then use the mark release capture technique to estimate the size of the population in the woodland and the garden.

then, would you say that you would perform some sor of statistical test to confirm whethere the results are signinficant or not? like a chi squared test?

the question is worth 6 marks.
2. (Original post by sssm)
i put that youd set up 2 traps, one in the garden and one in the woodland. use a random number generator to decide where to place the traps so to avoid bias.
yep, long story cut short here, explain about measuring tapes being used as axis. Also talk about quantity of traps eg. the more you use(randomly) then the more representitive it will be.

then leave both traps for a day and then use the mark release capture technique to estimate the size of the population in the woodland and the garden.

then, would you say that you would perform some sor of statistical test to confirm whethere the results are signinficant or not? like a chi squared test?

the question is worth 6 marks.
This looks right to me. If we are answering the question, you should definately mention that we have to carry out a statistical test on the data. To be sure, make sure you mention the test you think it is, if you have trouble finding which test it is, use this link which can be found on the AQA website http://store.aqa.org.uk/qual/gce/pdf...-TRB-OGSSS.PDF

hope this helps

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