Tuesday, 10 May 2011
Using quadrat technique to sample the population of daisies:
Use random sample (so not biased) also must be representative (large – for good results)
- Find random number to find the y and x axis numbers. For example if the random number was (3,3) the data would be taken from quadratic square (3,3)on the field.
- Each quadrate in this example is 1m by 1m
- Then count the number of daisies in that square
The sample needs to be representative Sample :
- The bigger the better
- 10 quadrates/ 10% of the actual area would be taken for the results
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Collecting data:
Make a table.
One column called ‘quadrates number’ and other column ‘Number of daisies per meter squared’
Add up column ‘Number of daisies per meter squared’
Divide the total from column ‘Number of daisies per meter squared’ by the number of quadrates
The result is the number of daisies per meter 2
Using this data we can compare the population of daisies with other field.
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