Pros & Cons of Sampling
- Created by: Sophie
- Created on: 21-03-13 18:12
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- Pros & Cons of Sampling
- Systematic
- Should produce an unbiased sample, can be carried out by machine.
- Nth item might coincide with a pattern, eg every 10th product is faulty, or without faults, which means there would be bias
- Should produce an unbiased sample, can be carried out by machine.
- Stratified
- If you have easy-to-define categories, you'll get a representative sample.
- Not useful when there are no obvious categories, and can be expensive.
- If you have easy-to-define categories, you'll get a representative sample.
- Simple Random
- Every member has an equal chance of being selected, so completely unbiased.
- Quota
- Quick and no sample frame is needed.
- Can be easily biased as sample depends on the interviewer, and those who refuse to take part may have similar views on the topic
- Quick and no sample frame is needed.
- Cluster
- Convenient, and can save on a lot of travel time if the population is spread over a large area,
- Easily biased eg. everyone living in the same postal district could have similar incomes or employment.
- Convenient, and can save on a lot of travel time if the population is spread over a large area,
- Convenience
- Done at a time and place which suits the interviewer, and a list of the whole population is not needed.
- No attempt to make the sample representative so there's a massive risk of bias.
- Done at a time and place which suits the interviewer, and a list of the whole population is not needed.
- Systematic
- Done at a time and place which suits the interviewer, and a list of the whole population is not needed.
- No attempt to make the sample representative so there's a massive risk of bias.
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