Sampling techniques

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What is a volunteer sample?
volunteers are selected by asking for people to take part; e.g. using an advert
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What is an opportunity sample?
Selected by availability and whoever is able to take part. The first people available.
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What is a random sample?
Identifying all members of the target population then using a random selection method to choose participants. Every member of the target population has an equal chance of being chosen.
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What is a systematic sample?
Selected participants using a system; every nth person on a list.
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What is a stratified/quota sample?
Randomly selects a predetermined number of participants from subgroups in proportion to their numbers in the target population. In quota, participants are chosen by opportunity. These methods provide proprtional representation of subgroups.
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Card 2

Front

What is an opportunity sample?

Back

Selected by availability and whoever is able to take part. The first people available.

Card 3

Front

What is a random sample?

Back

Preview of the front of card 3

Card 4

Front

What is a systematic sample?

Back

Preview of the front of card 4

Card 5

Front

What is a stratified/quota sample?

Back

Preview of the front of card 5

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