sampling

Opportunity sampling

ppts are readily available at time and place of study

Random sampling

everyone from target population has an equal chance of being chosen (use random name generator)

Stratefied sampling

collect sample to represent the categories in the target population + use random sampling for the categories

Volunteer sampling

people from target population put themselves forward for the study

Pros + cons of opportunity sampling

+: less time consuming

-: shared characterstics e.g employment, being a student so the sample is not diverse which hinders generalisability

Pros + cons of random sampling

+: could be diverse, no researcher bias

-: cannot guarantee diverse sample so hinders generalisability

Pros + cons of stratefied sampling

+: guarantees diverse sample so improved generalisability

-: time consuming

Pros + cons of volunteer sampling

+: less time consuming, already have informed consent

-: shared characterstics e.g extroversion