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7 Cards in this Set
- Front
- Back
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Sampling
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how you choose how you are going to pick the people into your study
-Effects external validity |
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Assignment
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how you put people into groups
-Effects internal validity |
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Probability sampling:
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1)Simple random sampling; randomly drawing a number, bingo
2)Systematic sampling: every nth person 3)Stratified sampling: |
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Stratified Sampling
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Proportional:
Hospitals- Wichita hospital vs great bend hospital Ie. House of representatives Nonproportional: don’t care about large or small the hospital, want the same number from each hospital Ie. Senate |
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Nonprobability sampling
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1) Samples of convenience: use who is readily available to use ( we will use this mostly)
2) Snowball sampling: telephone tree concept- find one person that fits it and then find more through them. 3) Purposive sampling: hand picked A) Usually used in a descriptive study Ex. ACL in book, kids in certain schools and reading level |
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2 mains goals of assignment to groups
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same size; create groups that are similar as possible
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5 ways to assign people
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1) Random assignment by individual: roll of die
2) Random assignment by block: 1st 8, 2nd 8, etc. 3) Systematic assignment: counting off 4) Matched assignment: matched on important characteristics and these subgroups are randomly assigned 5) Consecutive assignment |
