4.3: Quadrate Samples

+ Sand dune: using the quadrate technique to sample the population of daisies

+ Sample must be random (not biased) and representative (large enough for estimate to be closer to the truth)

+ Draw simple grid -> take random numbers Eg: 3, 3 and draw your quadrate in that square. Then count the amount of daisies in THAT quadrate.

+ For the representative the bigger the better. Eg: ten quadrates would be sufficient = 10% of actual area would be better.

+ Make table of two columns 1. The quadrate number Eg: 1,2,3,4 then the second column for the number of daisies in that quadrate. -> Add up the number of daisies and divide by the no. Of quadrates = the value= No. of daisies per m2.

+ using this we can estimate the population in area. Or we could compare the no. of daisies in two different areas.