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6 Cards in this Set
- Front
- Back
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What is a population |
The whole set of the items of interest |
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Census? Advantages and disadvantages? |
Observes or measures every member of the population Advantage: -completely accurate Disadvantages: -time consuming and expensive -cannot be used where the testing process destroys the item -Hard to process large quantities of data |
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Sample Advantages and disadvantages? |
A selection of observations taken from the population to find out information about the population as a whole Advantages: -less time consuming and expensive -doesn't use up the whole population -fewer people needed to respond -less time consuming Disadvantages: -data may not be as accurate -sample may not be large enough to give information about small sub groups of the population |
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Sampling units |
Individual units of a population, often individually named/numbered to form a list called a sampling frame |
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Sampling size |
Larger=more accurate More varied population means a larger sample is needed Different samples lead to different conclusions due to natural variance w/in population |
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Simple random sampling, and +s and -s |
Every sampling unit has an equal chance of being chosen (I.e lottery sampling, where names could be drawn out of a hat) +: -free of bias -easy and cheap for small populations and samples -each sampling unit has a known and equal chance of selection -: -not suitable for large -sampling frame is needed |
