4.3 Samplings with Quadrats

Method - to compare populations / to estimate populations


Sample - Random (no bias), using non-human factors e.g. Online, Tables.
               - Representative (large, estimation close enough to true population), 10% of area

Example: Sampling daisy population in field

1. Set up grid system across field (like x,y co-ordinates on graph) - EQUAL sizes

2. Place quadrat in 'random co-ordinates' (see above) given.

NOTE: Place quadrat in top-right hand side of 'co-ordinate'

3. Count population within quadrat (population/area ----> e.g. 10 daisies/1m^2)

4. Average = total sum of population / total amount of quadrat samplings

     --> (4+3+5) / 3 = 12 / 3 = 4 daisies/m^2