A sample of pps who are most easily available E.G. On the street.
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Advantages of opportunity sampling.
Less time consuming; cost effective; easy method; large sample sizes.
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Disadvantages of opportunity sampling.
Biased sample as it is only drawn from a small number of target population; ethical issues regarding consent and right to withdraw.
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What is a volunteer sample?
Participants put themselves forwards due to seeing an advertisement in a newspaper, etc.
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Advantages of volunteer samples.
Variety of pps; sample more representative; locates a niche group of pps.
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Disadvantages of volunteer samples.
Volunteer bias (more motivated and cooperative); only those who see the advertisement have a chance of being selected (reduced sample size).
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What is a random sample?
Pps nmes are drawn from a hat or selected on a computer; everyone has an equal chance.
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Advantages of random sampling.
Unbiased; greater population validity.
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Disadvantages of random sampling.
Not everyone you select will be willing to participate; representativeness not guaranteed; biased if too small.
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What is a stratefied sample?
Groups of pps are selected based on their frequency in the population to get a representative sample.
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What is a systematic sample?
Obtaining a representative sample by selecting every 5th or 10th person.
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What is a pilot study?
A trial run of a study to test if certain things dont work.
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Why should you do a pilot study?
Participants may not understand instructions; may guess what the study is about; may get bored due to too many tasks/questions; improvements can be made before spending time/money.
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Other cards in this set
Card 2
Front
Advantages of opportunity sampling.
Back
Less time consuming; cost effective; easy method; large sample sizes.
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