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| the science of collecting, organizing, summarizing, and analyzing info in order to draw conclusions |
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| identify objective, collect needed info, organize & summarize info, draw conclusions from info |
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| subset of the population that correctly represents the population |
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| # that describe data of sample (charts, graphs, measurements) |
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| the group & interviewer do not know who has a placebo |
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| characteristics of the individual within the population |
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| can't be measured in # (description) |
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| can be measured in numbers (countable) |
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| finite # of possible values, countable |
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| infinite # of possible values, not countable, anything on a scale |
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| list of observations, possibilities a variable can assume |
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| data can be obtained from these 4 sources... |
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| the census, existing sources, survey sampling, designed experiment |
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| list of all individuals in a population along with characteristics of the individuals |
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| ask a question with no attempt to influence the answer |
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| apply a treatment and study the results |
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| what is getting the treatment |
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| characteristics that may be related but have not been identified |
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| characteristics of an observational study |
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| ask questions, no control, no influence |
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| characteristics of an experiment |
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| treatment, have control, do influence |
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| random, stratified, systematic, cluster, convenience, multistage |
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| every possible individual has an equally likely chance of getting chosen |
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| list of all the individuals in a population |
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| separate population into non-overlapping groups and take a random sample from each group |
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| selecting every kth individual from the population |
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| randomly selected # between 1 & k (this is your starting #) |
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| how to find the xth person.. |
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| selecting all individuals within a randomly selected group |
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| bad! using individuals that are easily obtained & self selected |
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| using more than one method |
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| sampling without replacement |
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| you cannot use the same # twice |
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