RM: sampling Flashcards
1
Q
what are the 5 sampling techniques
A
Random, Systematic, Stratified, Opportunity, Volunteer
1
Q
Random sampling
A
- all members of population have chance of being selected
- list of all members of target population are obtained
- each member given a number
- sample is generated through lottery method
2
Q
systematic sampling
A
- every nth member of population is selected
- sampling frame produced -a list of people in the target population is organised into (Alphabetical)
- sampling system is nominated (Every 4th,12th ppt)
3
Q
stratified sampling
A
- researcher identifies the different ‘strata’ (sub-groups) that make up a population
- then, proportions needed for sample to be representative are worked out
- ppts that make up each stratum are selected using random sampling
4
Q
opportunity sampling
A
where researchers select anyone willing and available
5
Q
volunteer sampling
A
when ppts select themselves to be part of the sample
-obtained using newspaper adverts etc
6
Q
AO3 for random sampling
A
- free from researcher bias - researcher has no control over who is selected
- difficult/time consuming - complete list of target population may be hard to obtain
7
Q
AO3 for systematic sampling
A
- avoids researcher bias
- fairly representative i.e. unlikely to get all male ppts
8
Q
AO3 for stratified sampling
A
- avoids researcher bias
- most representative - fully randomised
- identified strata cannot represent all differences within population - so not wholly representative
9
Q
AO3 for opportunity sampling
A
- convenient + saves researcher money/time
- unrepresentative - drawn from a specific area
- researcher has control over ppts (researcher bias)
10
Q
AO3 for volunteer sampling
A
- requires minimum effort - less time consuming
- may attract a certain ‘profile’ of person
