4.3 Quadrates samples

using the quadrate technique in sampling the distributions of organisms in their habitat.

the sample has to be :
-  random ( not biased )
-  representative ( large enough )

how to carry out quadrate SAMPLES:
-  separate the area in the field into a grid working like the x y coordinates of a graph
-  generate 2 random numbers representing the x coordinate and the y coordinate
-  find the coordinate on the graph, and then in the real area
-  count the number of species you are trying to compare in that particular square
-  the experiment is repeated

REPRESENTATIVE sample
a representative sample is one large enough, the bigger the better, the larger the sample is the closer it is to the real value of the field.

the data is recorded in a table, the average is found ( number of species in all data collected/number of quadrates)
this experiment cam show the average population of a particular species in one particular area, results can also be used to compare the population of the same organism in another area.