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Phil12_S11_Causation_when_experiments_are_not_possible(5-26-2011)

Phil12_S11_Causation_when_experiments_are_not_possible(5-26-2011)

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Studies of causation when experiments are not possible Phil 12: Logic and Decision Making Spring 2011 UC San Diego 5/26/2011 Thursday, May 26, 2011
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Announcements Paper 2 due 11am Tuesday - note distinction between experiments, prospective, retrospective studies Sample final exam questions will be posted today - can review in section next week - I’ll have extra office hours next week and before final exam Please complete your CAPEs! Thursday, May 26, 2011
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Can you use random assignment to control for subject variable confounds in a within-subjects design? A. Yes B. No C.Not sure Clicker Question Thursday, May 26, 2011
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What’s the main strategy for controlling procedural variable confounds? A. Randomization B. Locking C.Matching D.Making the variable another factor to be studied E. Not sure Clicker Question Thursday, May 26, 2011
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Review Main strategy for controlling procedural confounds: locking Two major strategies for controlling subject confounds - Randomized between-subject designs Major risk: non-equivalent groups of subjects - Counterbalanced within-subject designs Major risk: contamination of subjects Thursday, May 26, 2011
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Planning an experiment Say the color the following words are written in: Blue Brown White Red Brown Yellow Green Orange Thursday, May 26, 2011
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Does it seem harder to name the color when the words name a different color? A. Yes B. No C.Not sure Clicker Question Thursday, May 26, 2011
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Planning an experiment - 2 How might we test the claim that it is the meaning of the word that makes it harder to say the color it is written in? - Operationalize IV and DV Being hard to read (DV): Slower reaction time when incongruent words - Note: Pretest-posttest design about measuring DV - Identify a sample population College undergraduates in psychology courses - Pick study design Between-subject vs Within-subject? Thursday, May 26, 2011
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Between subjects Roger Shane Sara Jessica Jim Angela Megan Peter Brown Brown Thursday, May 26, 2011
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Within subjects Jim Angela Megan Peter Jim Angela Megan Peter Brown Brown Thursday, May 26, 2011
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Counterbalance - 1 Congruent word condition Incongruent word condition Jim Angela Jim Angela Congruent word condition Incongruent word condition Megan Peter Megan Peter Thursday, May 26, 2011
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Counterbalance - 2 Jim Congruent Incongruent Congruent Incongruent Angela Incongruent Incongruent Congruent Incongruent Megan Congruent Incongruent Incongruent Incongruent Peter Incongruent Congruent Incongruent Congruent Random sequence of 4 words Thursday, May 26, 2011
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Controlling subject variable confounds What subject variables might you have to worry about as confounds? How to control for these confounds - If between-subject: Randomize - If within-subject: Counterbalance Blue Brown White Red Brown Yellow Green Orange Thursday, May 26, 2011
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Controlling procedural variable confounds What procedural variables should be controlled to avoid confounds?
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