101 Ch. 13 - Chapter 13 Experiments Objectives Know the...

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Chapter 13 Experiments
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Objectives Know the difference between an observational study and an experiment Apply the basic principles of experimental design: Control, Randomization, Replication, Blocking Be able to diagram an experiment Understand the value of a placebo and blinding in experiments
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Observational Study Observing data in “the wild” Researchers don't assign treatments to subjects; they simply observe them Retrospective Study Prospective Study Results show association, but do not prove causation.
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Experiments A way to prove a cause and effect relationship between two or more variables Manipulate explanatory variable Observe response Experimental Units – individuals on whom an experiment is performed
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Experiments Factors – explanatory variable(s) Need at least one factor for every experiment Levels – specific values that the experimenter chooses for a factor Need at least two levels for each factor Treatments – different levels of a single factor or are combinations of levels of two or more factors
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An ad for OptiGro plant fertilizer claims that with this product we will grow “juicier, tastier” tomatoes. We'd like to test this claim and see if we can get by with a half-dose. Factor: OptiGro Fertilizer (3 levels)
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This note was uploaded on 03/30/2008 for the course STAT 101 taught by Professor Graham during the Spring '08 term at Iowa State.

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101 Ch. 13 - Chapter 13 Experiments Objectives Know the...

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