sampling methods

what is opportunity sampling?

people who are available and willing to take part

What are the 2 advantages of opportunity sampling?

convenient

time and cost effective

What are the disadvantages of opportunity sampling?

may be unrepresentative

potential researcher bias

What is random sampling?

all members of the target population have an equal chance of being selected

What are 2 disadvantages of random sampling?

difficult to get full target population list

unrepresentative

What is an advantage of random sampling?

no researcher bias

what is stratified sampling?

Dividing the population into subgroups then selecting a sample from each of these groups

What are 2 advantages of stratified sampling?

representative

free from researcher bias

What are 2 disadvantages of stratified sampling?

does not represent all the ways people are different

time consuming

What is systematic sampling?

Every nth person is selected

what are 2 advantages of systematic sampling?

objective

free from researcher bias

what are 2 disadvantages of systematic sampling?

can be time consuming

participants may refuse

What is volunteer sampling?

participants selecting themselves to be part of the sample

What are 2 advantages of volunteer sampling?

convenient

time and cost effective

What are 2 disadvantages of volunteer sampling?

may be unrepresentative

potential researcher bias

What is the target population?

the wider group that the researcher wishes to generalise their findings to