Quantitative investigations of variation within a species Flashcards
1
Q
How do you get representative samples
A
Random sample—> eliminate bias
Large sample size
use stats test
2
Q
How do you carry out random sampling
A
Divide the area into a grid of numbered lines
Use random number generator to obtain coordinates
Using quadrat count the species
3
Q
How does have large samples give you representative samples
A
Minimises the effect of chance and so anomalies have less influence and can be identified.
4
Q
How does Stats test give representative samples
A
see if variation observed is or isn’t due to chance
5
Q
What does mean show
A
if there is a variation between samples. Useful for comparisons but provides no info about the range
6
Q
What does SD show
A
Higher the SD the higher the variation
If SD overlaps difference is due to chance.
