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12 Cards in this Set
- Front
- Back
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population
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entire set of observations of interest
(can be difficult) |
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sample
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subset of observations from population of interest.
want representative samples |
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statistics
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provides a way for collecting, organizing and interpretting sample data.
provides characteristics of samples and helps make estimates about populations |
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how is statistics different from parameters?
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parameters provide characteristics of entire population of interest
statistcs- sample parameter- population |
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rule of thumb in symbolizing
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statistc- roman letter
parameter- greek letter |
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what does stats accomplish?
2 types of stats.. |
descriptive stats- organize and summarize data
inferential stats- infer about populations based on sample data, draw conclusion |
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variable
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something that exists in more than one amount
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dependent variable
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the one being measured.
outcome of interest in experiment. depends on independent variable |
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independent variable
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explains DV differences
causes changes |
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extraneous variable
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confounding or nuisance,
messes things up |
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constant
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values don't change
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dependent variables divided into..
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levels (treatments) of independent variables.
if haircolor depended on number of pencils, group into 0 pencils, 1 pencils... |
