# 2.3.2 Non probability sampling Flashcards

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1
Q

what is involved in non probability sampling?

A

no sampling frame
not everyone in target population had equal chance of being selected
simpler methods

2
Q

what are the four non probability sampling methods?

A

opportunity sampling
self selected sampling
snowball sampling
quota sampling

3
Q

what is opportunity sampling?

A

select participants from those of the population available at the time

4
Q

what are strengths of opportunity sampling?

A

easy to conduct
cheap
simple and convenient

5
Q

what is a weakness of opportunity sampling?

A

sample is unlikely to be representative

6
Q

what is self selected sampling?

A

participants select themselves e.g. in response to an advert

7
Q

what is a strength of self selected sampling?

A

participants volunteer themselves, so they are willing which means you likely will have reduced drop out rates

8
Q

what is a weakness of self selected sampling?

A

majority of target population unlikely to respond
unrepresentative
those who respond will be atypical

9
Q

give an example of how a self selected sample may be atypical:

A

e.g. research involving maths - people who like maths or who are good at it are likely to respond

10
Q

what is snowball sampling?

A

ask initial participant to suggest others who may be appropriate and willing to participate

11
Q

what is a strength of snowball sampling?

A

useful for accessing hard to track populations such as gangs or drug users

12
Q

what is a weakness of snowball sampling?

A

researcher has little control over sample

unrepresentative - participants nominate people they know well - similar traits and characteristics

13
Q

what is quota sampling?

A

the researcher divides the population into sub categories (like stratified) and then meets the proportion of quota using opportunity, self selected or snowball sampling,

14
Q

what is a strength of quota sampling?

A

most representative non probability sampling method

15
Q

what is a weakness of quota sampling?

A

time consuming