How is variation measured?
by taking samples
measuring every aspect of organism
What is sampling?
taking measurement of individuals, selected from the population of organisms which are being investigated
observing especially in order to evaluate general health or determine the cause of illness.
observing the species of an organism
How may sampling bias be prevented?
Random sampling, using large sample size or analysing data collected
have human involvement any way possible to prevent bias
Why may a sample not be representative of the population as a whole?
sampling bias or by chance
species are different
its very hard to investigate all species