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22 Cards in this Set
- Front
- Back
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observational studies
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observe individuals and measure variables of interest
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experiment
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deliberately imposes some treatment on individuals in order to observe responses
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simulations
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when its impossible to observe individuals or logistically difficult or inconvenient
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sampling
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studying a part to get information about the whole
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census
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attempts to contact every individual in the population
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design
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method chosen to pick a sample from a population
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SRS
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simple random sample. ex: names out of a hat
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convenience sampling
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no random device
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voluntary respose sample
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people choose to be in the sample
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judgement sample
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a so called "expert" chooses their sample
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problems
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creates bias because it favors some parts of the population
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table of random digits
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each member of the population is assigned a number and then use table B to pick the numbers
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stratified random sampling
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population is divided into groups based on similarity and then an SRS is chosen from each strata
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systematic sampling
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population is ordered and sample is chosen systematically
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cluster sampling
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groups are chosen rather than individuals
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experimental units
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the individuals on which the experiment is done
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subjects
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human units
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treatment
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the condition applied to the units
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factor
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explanatory variables of an experiment
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level
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the value of a factor
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placebo
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dummy pills sometimes used for control
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double-blindness
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when experimenter and a subject both dont know the treatment
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