11 - October 11 Hypothesis 1

11 - October 11 Hypothesis 1 - "It's choice -...

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Unformatted text preview: "It's choice - not chance - that determines your destiny." Jean Nidetch Experimental Process Subjects Treatment Observation Variables Explanatory Variable (Independent variable) Response Variable (Dependent variable) Lurking or Confounding Variable Alternative Experimental Designs Completely Randomized Design Block Design Matched Pairs Design Double Blind Design Completely Randomized Design Simplest Design Strategy Each subject is randomly assigned to one group Typically, group sizes are identical Completely Randomized Design Subjects Subjects Group A Group A Group B Group B Group C Group C Adams Adams X Allen Allen X Bailey Bailey X Dalton Dalton X Gray Gray X James James X Roberts Roberts X Smith Smith X White White X Block Design Used when known extraneous variables may influence the experiment Subjects are pre-sorted by the influencing variables, then partitioned into similar blocks Subjects from each block are randomly assigned to groups One-Dimensional Block Design to Control Age Age Subject Group A Group B Group C 16 Gray 17 May May Gray Lee 20 Lee 28 Jones 29 Cooper Smith Jones Cooper 29 Smith 30 Adams 33 Brown Brown Adams Magee 34 Magee Matched Pairs Design Each subject receives each treatment Treatment sequence is randomly chosen for each subject Matched Pairs Design Subjects Treatment Order Adams A B C Allen A C B Bailey B A C Dalton C B A Gray A B C James C B A Roberts B C A Smith C A B White A C B Double Blind Experiment Neither the subjects nor the investigators know which treatment is administered Control Minimize the effects of lurking/confounding variables on the response, most simply by comparing several treatments. Randomize Use impersonal chance to assign subjects to treatments . Replicate Repeat the experiment on many subjects to reduce chance variation in the results. Statistical Significance Statistical Significance An observed effect so large that it would rarely occur by chance. Hypothesis Testing...
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This note was uploaded on 03/01/2008 for the course MIS 311F taught by Professor Cleveland during the Fall '07 term at University of Texas at Austin.

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11 - October 11 Hypothesis 1 - "It's choice -...

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