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Research methods revision
Opportunity sampling
Taking the sample from people who are available to you at the time of the study
and fit the criteria you are looking for.
Advantages: Quick and easy- so you can get a large sample which tends to
be more representative of the target population.
Disadvantages: doesn't show the entire population and so not representative
so the results could be biased meaning they will lack validity
Random sampling
Where every person has equal chance of being chosen. A sample is taken by
writing down all the names of those in the target population on equal size slips of
paper and folding them all in the same way and putting them in a container. They
are then mixed up and the required amounts of participants are pulled out. The
slips are mixed up each time a participant is chosen.
Disadvantages: small random samples are always biased as they don't
represent the population accurately, not everyone who is in the target
population will want to take part in your study so you may not get a
representative sample, time consuming so it is hard to get a large sample
which typically are more representative of the target population than
smaller samples.
Stratified sampling
Involves classifying the population into categories and choosing a sample which
consists of participants from each category in the same proportions as they are in
the target population.
Advantages: most representative sampling method as long as the categories
are identified correctly
Disadvantages: time consuming as categories have to be decided as well
writing all the participants names down before selecting them at random
from each category.
Volunteer sampling
Participants volunteer in response to an advert to take part in a study
Advantages: quick and easy so a large sample can be collected so the results
are more likely to represent the target population

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Research methods revision
Disadvantages: biased as only people who want to take part will be involved
in your study which is a problem as they will be more motivated so will be
at a higher risk of demand characteristics.…read more


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