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| Science of collecting, organizing, summarizing, and analyzing information to draw conclusions or answer questions |
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| Hidden variable affecting outcome |
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| Organize and summarize information |
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| Uses methods that take results from sample, extends them to the population, and measures the reliability of the result |
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| Neither doctor nor patient know if patient is in the control or experimental group |
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| Data dealing with characteristics |
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| A way to look at and organize a problem to find a solution |
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| Quantitative Variable with either a finite number of possible values or a countable number of possible values |
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| Quantitative variable with infinite possible values |
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| A group used for comparison |
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| Does not show causation (measures characteristics of a population, but does not attempt to manipulate or influence variables) |
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| Has treatment and shows causation |
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| Something researchers administer to experimental units |
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| AP Format for Random Sample |
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1. Give everyone in population a number
2. Randomly choose a number
3. The person who matches the number is in the sample
4. Repeats are thrown out
5. The process is repeated until you have enough people in sample |
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| Separating population into non-overlapping, homogeneous (individuals are similar in some way) groups called strata then obtaining a simple random sample from each stratum |
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| Selecting every nth individual from the population for sample |
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Selecting all individuals within a randomly selected collection or group of individuals
(i.e. separate room into quadrants and say group 2 is the sample) |
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| Individuals are easily obtained |
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