OBSERVATIONAL AND EXPERIMENTAL STUDIES

OBSERVATIONAL AND EXPERIMENTAL STUDIES - Treatment and...

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OBSERVATIONAL AND EXPERIMENTAL  STUDIES Experimental Study Build it by changing one variable in a group but the other one stays the same Two groups  Treatment group Control group Manipulate the variable Point is to see if you change that one variable what will happen Observe change in other variable Dependent variable If the result is that there is no different then you agree that there is no affect Manipulate the variable Treatment given randomly Observational Study No manipulation Does that mean no control? Do have control through nature like some people get more sunlight then others  Not experimental because you can not control it 
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Unformatted text preview: Treatment and control Quasi experimental study Nothing manipulated, subject choose what they want Treatment is not given randomly Supposed to be t-chart A (independent variable) Tomatoes Sunlight B (dependent variable) Death Happiness A causes B The value of B depends on A Confounding variable Ex: Drugs, temperature, weather, timing, economy Not in the study but affect the study Mis?Uses of Stats (7) Different ways to talk above averages How people state things Visually misleading graphs Misleading sample size Misleading questions to get them to answer a certain way...
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This note was uploaded on 11/07/2011 for the course SPEA-K 300 taught by Professor Wakhungu during the Fall '09 term at Indiana.

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OBSERVATIONAL AND EXPERIMENTAL STUDIES - Treatment and...

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