Chapter 10 Part 1 - Skeleton

Chapter 10 Part 1 - Skeleton - Psy250: Scientific Inquiry...

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Complex Experimental Designs Psy250: Scientific Inquiry Chapter 10
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Recall… Simplest experimental design: One I.V. manipulated with 2 levels, one D.V. measured
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Increasing the Number of Levels of an Independent Variable Design with only 2 levels of the I.V. cannot provide much information about the nature of the relationship between variables Variables sometimes related in a curvilinear fashion - Need at least 3 levels.
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Increasing the Number of Levels of an Independent Variable Researchers frequently interested in comparing more than 2 groups Ex. Crusco and wetzel: looked at effects of having servers touch restaurants customers on tips servers received. Compared shoulder-touching, hand-touching, and no- touch control. Found that both kinds of touching increase tips Ex. Strayer and drewes: looked at effects of talking on phone and driving. Compared hands-free cell phones, hand-held cell phones, and no-phones control. Found that both cell phones impair driving.
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Increasing the Number of Independent Variables: Factorial Designs Researchers often manipulate more than 1 I.V. in a single experiment - 2 or 3 I.V’s operate simultaneously - Closer approximation of real-world *Factorial designs: All levels of each I.V. are combined with all levels of other I.V.’s
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Increasing the Number of Independent Variables: Factorial Designs Simplest factorial design: 2x2 ( two by two) - Two IV’s each w/ 2 levels - Results in 4 experimental conditions.
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Increasing the Number of Independent Variables: Factorial Designs Example of 2x2 design: - under what conditions will people let you cut in front of them at a copy machine?
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This note was uploaded on 03/10/2011 for the course PSY 250 taught by Professor Briannalharris during the Summer '10 term at State University of New York.

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Chapter 10 Part 1 - Skeleton - Psy250: Scientific Inquiry...

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