term test 1 cheat sheet.docx - UNIT ONE Target population...

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UNIT ONE: Target population: who is targeted as a whole. Parameter of interest: what are they doing with the who is experimented. Parameter: characteristic about population. Statistic: about sample. Simple Random Sample (SRS): sample from finite population, everyone has an equal chance of being in the sample. Stratified Random Sample: divide population into strata (groups), natural grouping structure, everyone gets represented. Cluster Sample: divide population into groups then randomly select clusters, space/time differences between groups. Voluntary-response sample: lead to bias with strong opinions. Convenience sample: lead to bias/unrepresentative sample. Selection bias: selection doesn’t represent the population. Non-response bias: individuals have different responses than those not in the sample. Measurement error bias: information given/recorded is incorrect, could be involuntary or voluntary. Type of studies: observational & designed. Observational studies are susceptible to lurking variables. Well-designed experiments are not

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