Ch5Def - variables in a study but is not one of the...

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STAT 110 Chapter 5 Definitions An experiment deliberately imposes some treatment on individuals in order to observe their responses. The purpose of an experiment is to study whether the treatment causes a change in response. subjects – individuals studied in an experiment treatment – any specific experimental condition applied to the subjects response variable – a variable that measures an outcome or result of a study explanatory variable – a variable that we think explains or causes changes in the response variables lurking variable – a variable that has an important effect on the relationship among the
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Unformatted text preview: variables in a study but is not one of the explanatory variables studied confounding – two variables are confounded when their effects on a response variable cannot be distinguished from each other Æ confounded variables can be either explanatory or lurking placebo – a dummy treatment with no active ingredients that is used to control for psychological effects, especially in medical experiments placebo effect – the response of patients to a placebo statistical significance – an observed effect so large that it would rarely occur by chance...
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This note was uploaded on 02/10/2011 for the course STAT 110 taught by Professor Johnson during the Spring '07 term at South Carolina.

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Ch5Def - variables in a study but is not one of the...

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