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5 Cards in this Set
- Front
- Back
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Opportunity |
Participants are selected by using people who are most easily available. Strengths: Quick & easy to collect. Weaknesses: Biased, as most participants are the same so it won't be representative of the population. |
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Volunteer |
Participants are selected by asking for volunteers e.g. placing an ad in the newspaper. Strengths: Can access a motivated section of the population. Weaknesses: Tends to attract a specific type of person making data biased. |
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Random |
Participants are selected by using a random number technique. Strengths: Unbiased as everyone has an equal chance of getting picked. Weaknesses: May result in a freak sample which isn't representative. E.g. 100% Boys, 0% Girls |
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Quota/Stratified |
Sub-Groups within a population are identified, then a predetermined number is taken from each proportion to their representation. Strengths: More representative of the population. Weaknesses: Selection within sub-groups may be biased. |
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Snowball |
Getting one or two participants & having them pull in more participants. Strengths: Good for collecting participants that are hard to identify. Weaknesses: May take a long time to collect. |
