11 - October 11 Hypothesis 1

11 - October 11 Hypothesis 1 - "It's choice not chance that...

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"It's choice - not  chance - that  determines your  destiny."  Jean Nidetch
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Experimental Process Subjects Treatment Observation
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Variables Explanatory Variable (Independent variable) Response Variable (Dependent variable) Lurking or  Confounding Variable
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Alternative  Experimental Designs Completely Randomized Design Block Design Matched Pairs Design Double Blind Design
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Completely  Randomized Design Simplest Design Strategy Each subject is randomly assigned  to one group Typically,  group sizes are  identical
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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 X Smith Smith X White White X
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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
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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
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Matched Pairs  Design Each subject receives each  treatment Treatment sequence is randomly  chosen for each subject
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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
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Double Blind  Experiment Neither the subjects nor the  investigators know which  treatment is administered
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Control Minimize the effects of  lurking/confounding variables on  the response, most simply by  comparing several treatments.
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Randomize Use impersonal chance to assign  subjects to treatments .
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Replicate Repeat the experiment on many  subjects to reduce chance  variation in the results.
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Statistical Significance Statistical Significance An observed effect so large that it would rarely occur by chance.
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