STAT-2126EL Lecture Notes - Lecture 3: Experiment, Tape Measure, Htc Sense
12 Sep 2018
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Independent variable: manipulated by researcher (also called i. v) Things we think will cause change to the d. v: dependent variable: measured by the researcher (also called d. v) Extraneous variable: factors that could realistically affect the d. v but are not systematically producing difference between groups. Need to think of all possible things that can affect d. v so they don"t become an unwanted variable: cofounding variable: factors that affect the d. v and systematically cause a difference between groups. I. v: alcohol: type of alcohol: beer, % of beer: 5, # of beer: 5, time frame to drink beer: 45 min. Worry about extraneous variables (driving experience: need a criteria on "good driving" Don"t take a chance, think ahead: constants: conditions that don"t change, participants/ subjects: randomly selected and randomly assigned, random sampling is ideal but not always perfectly possible, random assignments is always possible!
