two, There are .... strands of sampling., sample, Researchers cannot study everyone, therefore, they need a ...., snowball, When you use a .....sample one person leads to another., systematic, ....sample = you pick every nth person from the sampling frame, frame, a sampling....is needed for a random sample, non, a ....random sample is used when a sampling frame is not available, simple, ...random sample - like picking names out of a hat, stratified, ....sample = the sampling frame is divided up into categories, e.g. age, gender etc, volunteer, ....sample = people self-select, opportunity, ....sample = you pick people who are around at the time, quota, ...sample = when the researcher does not have a sampling frame but wants to make sure the sample is representative, representative, when a sample mirrors the wider population, we call it...., generalisable, findings from a representative sample will be more...., techniques, there are different sampling...., sampling, ....techniques

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