PPT3 - 1/16/2010 SingleFactorvs.MultifactorStudies

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1/16/2010 1 Single Factor vs. Multifactor Studies Effects of class size on anxiety Experimental study Relationship between sociability and anxiet anxiety Correlational study What if you wanted to know whether the variation in anxiety in different size classes is influenced by how high or low a person is in sociability? Multifactor study Multifactor Studies Objective To examine the combined effect (interaction) of two or more variables on an outcome variable Types All manipulated variables All correlational variables Mixed variables Graphs Portraying Multifactor Research Main effects Make general statement about each individual variable (e.g., 16 Low Sociability High Sociability class size, sociability) and the dependent measure (anxiety) 0 2 4 6 8 10 12 14 Small Class Large Class Anxiety Graphs Portraying Multifactor Research Main effects Make general statement about each individual variable (e.g., class size, sociability) and the 16 Low Sociability High Sociability dependent measure (anxiety) Interactions Qualify the effect of one variable on the dependent measure by taking the other variable into account 0 2 4 6 8 10 12 14 Small Class Large Class Significance Index of believability or meaningfulness of relationship Clinical or practical significance indicates that the observed relationship has meaningful, real world consequences Statistical significance suggests a relationship is unlikely to be the result of chance Statistics Statistics are numbers summarizing the results from a research project Descriptive statistics describe the sample Inferential statistics are used to test hypotheses Hypotheses can never be proven, only disproven
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1/16/2010 2 Hypothesis Testing Correct Hypothesis Research Results ?
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This note was uploaded on 04/27/2010 for the course PSY 0105 taught by Professor Williamklein during the Spring '08 term at Pittsburgh.

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PPT3 - 1/16/2010 SingleFactorvs.MultifactorStudies

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