Chapter 9 Part 2 - Skeleton

Chapter 9 Part 2 - Skeleton - Psy250 Scientific Inquiry...

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Conducting Experiments Psy250: Scientific Inquiry Chapter 9
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Notes About Attendance Assignment From Last Class repeated measures design: same individuals participate in all conditions ( types of pizzas) Problems w/ repeated measures designs Order effects: order in which pizza was eaten might affect quality/taste rating. Fatigue effect: participant becomes tired, bored, distracted, full Contrast effect Fix it. .make it independent group design. Add more time in between slices.
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A Lot to Consider When Running an Experiment Who will be in our study? How do we manipulate the independent variable? What do we need to think about when measuring a dependent variable? What happens when the study is done?
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Measuring the Dependent Variable Don’t forget: reliability, validity, reactivity, observational methods, survey design In most experiments 1 of 3 general types of dependent variables used: Self-report measures Behavioral measures Physiological measures
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Self-Report Measures Can measure many aspects of human thought and behavior Individuals asked to respond to questions posed by an interviewer or questionnaire
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Behavioral Measures Direct observations of behaviors Could choose from an endless number of behaviors Might record: Whether or not behavior occurs Number of times behavior occurs in given time period How quickly a response occurs after a stimulus How long behavior lasts
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Behavioral Measures What is measured depends on question of interest and on how independent variable is manipulated Some variables necessitate self-report or behavioral measure For many variables, however, both self-report and behavioral measures appropriate When both are possible a series of studies could be run
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Behavioral Measures Examples Seating distance as measure of attraction Seating distance as measure of prejudice Speed w/ which partner is associated w/ positive words as measure of partner valuing # of pieces of candy eaten as a measure of desire to be accepted Length of time hand submerged in cold water as measure of perseverance or pain tolerance # of drops of hot sauce put on someone else’s food as measure of aggression/
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Physiological Measures Record responses of the body Galvanic skin response (GSR): skin conductance: emotional response and anxiety. Electromyogram (EMG):
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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 9 Part 2 - Skeleton - Psy250 Scientific Inquiry...

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