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17 Cards in this Set
- Front
- Back
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Population |
A collective group being surveyed |
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Census |
A collection of data from every member of a population |
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Sample |
A subgrouop taken from the population |
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Sampling Frame |
A list or database of all members of a population. |
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Random Sampling |
Every element in a population has an equal chance of being selected for a sample. |
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Biased Sampling |
Every element in a population does not have an equal chance of being selected for a sample. |
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Simple Random Sampling |
1. Create a sampling frame 2. Randomly select elements from the frame to be in the sample. Essential when sampling large groups. |
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Stratified Random Sampling |
1. Divide the population into Strata (organized groups) with similar attributes. 2. Apply simple random sampling to each stratum. Ensure that contrasting segments of a population are equally represented. |
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Cluster Random Sampling |
1. Divide a population into clusters (groups that are representative of the whole population). 2. Use random sampling to select a sample of clusters. 3. Survey each element within those clusters. Saves money. |
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Systematic Random Sampling |
1. Divide the size of the frame (N) by the desired sample size (n) to get the index number (k). 2. Starting with a randomly selected number, choose every kth element in the frame. If N = 500 and n = 50 we would choose ever 10th item from the frame. Patterns within a population may skew the sampling results. |
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Convenience Sampling |
A sampling of the most readily available elements of the population. |
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Quota sampling |
A poplulation is divided into groups and then uses convenience sampling to fill a quota of required samples. |
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Snowball Sampling |
When an interviewer asks if a subject can provide friends to be interviewed. |
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Survey |
A method of data collection where individuals are asked questions in order to measure ideas, opinions, and experiences. |
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Voluntary Response Bias |
People with strong opinions are more likely to respond to a poll. |
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Nonresponse bias |
When a survey receives little to no response. |
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Response Bias |
When people respond with a knowingly false answer. |
