Chap5_SV - Observational Study or Experiment Observational...

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1 Chapters 5 Experimental Design Observational Study or Experiment Observational studies are _______. We do not assign choices; we simply observe them. • ________________ are active. We impose some __________________ in order to see what happens. If properly designed, we can observe whether ___________________ relationships are present. Vocabulary of Experimental Design • Response or Outcome Variable : A variable whose ____________ we wish to study . • Explanatory Variable or Factor : A variable that explains or ___________ changes in the response variable. • Subjects : Individuals in an experiment. Factors, Levels,Treatments •Fac to r : explanatory variable • Levels: the specific values that the experimenter chooses for the _______. • Treatment : The combination of specific levels from all the _________ that a experimental unit can receive. Example • Does the amount of sleep and exercise you get affect your work performance?
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This note was uploaded on 04/07/2008 for the course STAT 110 taught by Professor Johnson during the Fall '07 term at South Carolina.

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Chap5_SV - Observational Study or Experiment Observational...

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