11.2

Question 1

define random sampling

Answer 1

selecting individuals by chance in a random sample so they each have an equal likelihood of selection

Question 2

what are the types of non random sampling

Answer 2

opportunistic - uses organisations conveniently available
stratified - pop divided into strata based on characteristic and then random sample taken from each proportional to strata size
systematic - identify different areas within an overall habitat and sample separately (belt/line transecting)

Question 3

why is it often unreliable

Answer 3

sampling bias - accident or deliberate

chance - coincidence

Question 4

what minimises unreliability

Answer 4

random sampling as removes human involvement

large sample size as less probability chance will influence result

Question 5

define sampling

Answer 5

taking measurements of a limited number of individual organisms present in a particular area