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1

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

2

What are the 5 types of sampling

Random sampling

Systematic sampling

Stratified sampling

Opportunity sampling

Volunteer sampling

3

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

4

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

5

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

6

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

7

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.