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What is sampling?

Psychological studies involve samples drawn from a larger population called the target population.

Samples should be representative of the whole population while being of a decent size


What are the 5 types of sampling

Random sampling

Systematic sampling

Stratified sampling

Opportunity sampling

Volunteer sampling


Random sampling

Random sampling- is when every member of the target population has an equal chance of being selected

+) sample is likely to be representative

-)not all members of the target population will be willing to take part but also hard to get specific details


Systematic sampling

Systematic sampling is where participants are chosen by taking every Nth person from a list

+) systematic sampling is very simple compared to other sampling techniques

-) it may not be representative if the processes interacts with a hidden trait in the population


Opportunity sampling

Opportunity sampling involves selecting participants who are readily available to take part

+) this is the most easy and practical method for insuring large samples

-) there is a high chance it will not be representative, and may feel obliged to take part even if they don’t want to which is unethical


Volunteer sampling

Volunteer sampling is when people self elect to tasked part in the research

+)This can be a useful way of finding specific people to take part in particular areas of research

-) certain type of people such as people who want to be useful, extroverts or who are interested in the research will volunteer so it won’t be representative


stratified sampling

Involves categorizing the target population and randomly choosing participants in the same proportions in terms of categories as in the target population.

+) all groups are included so it is representative

-) Time consuming to make categories and hard if you don't know a lot about your target population.