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 fnal exam questions will be posted today - can review in section next week - I’ll have extra oFfce hours next week and beFore fnal 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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Phil12_S11_Causation_when_experiments_are_not_possible(5-26-2011)

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