stat test 1

# stat test 1 - -statistics the study of how to collect...

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-statistics- the study of how to collect, organize, analyze, and interpret numerical information -population- entire group of people or objects about which we want information -sample- subset of the population for which we gather data -voluntary sample- bias -convenience sample- bias -census- sample consisting of the whole population. (expensive, time consuming, never perfect) -nominal- data only put into categories (hair color) -ordinal- we can determine whether one unit has more of the property being measured than another (football ranking) -interval- we can tell how much more of the property one unit has than another (temperature) -ratio- we can tell the actual amount of the property each unit possesses (has a 0, weight in kg) -simple random sample- each subset of n units from the population has the same chance of being selected -stratified sampling- divide population into strata and take a simple random sample from each stratum -systematic sampling- sample at regular intervals in data stream

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