Sampling Methods
- Created by: Emily
- Created on: 21-05-13 14:41
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- Sampling Methods
- Volunteer Sampling
- Individuals who have chosen to take pert in the study - may have responded to an advert
- ++ Quick and economical, common and informed consent already given
- -- Unrepresentative only a certain type of people will put themselves forward, who will see the advert
- Random sampling
- aksing people in the street, pulling names out of a hat ect
- ++ large samples provides unbiased results everyone has chances of selection
- -- time consuming, too small sample leads to bias
- Stratified and Quota Sampling
- Diving the population into important sub categories then selecting 25% of those
- ++ Representitive of the target population - equal from subgroups
- -- can be time consuming, has to be quite a large sample size
- Systematic sampling
- all participants in a list every 10th person is chosen
- ++ unbiased system
- -- if one person says no the whole system breaks down
- Volunteer Sampling
- Opportunity Sampling
- Sampling Methods
- Volunteer Sampling
- Individuals who have chosen to take pert in the study - may have responded to an advert
- ++ Quick and economical, common and informed consent already given
- -- Unrepresentative only a certain type of people will put themselves forward, who will see the advert
- Random sampling
- aksing people in the street, pulling names out of a hat ect
- ++ large samples provides unbiased results everyone has chances of selection
- -- time consuming, too small sample leads to bias
- Stratified and Quota Sampling
- Diving the population into important sub categories then selecting 25% of those
- ++ Representitive of the target population - equal from subgroups
- -- can be time consuming, has to be quite a large sample size
- Systematic sampling
- all participants in a list every 10th person is chosen
- ++ unbiased system
- -- if one person says no the whole system breaks down
- Volunteer Sampling
- Taking a sample from people who are available at the time. Stopping pupils in the corridor or going into a year 7 classroom
- ++ convenient and ethical. Wide variety of ppts leading to a representative
- -- Unrepesentitive samples can be bias as we are likely to choose helpful looking people. Only a subgroup of the target population
- Sampling Methods
- Sampling method
- Sampling method description and eg
- positives
- negatives
- Sampling method description and eg
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