bias - 031:010 - Research Methods in Psychology Spring,...

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031:010 - Research Methods in Psychology Spring, 2010 April 13 th
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Major Threats to Internal Validity Confounds! any source for a difference between conditions (or the suppression of a difference) other than the intended independent variable 2
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Outline Standard (text) Story experimenter vs participant bias Better way to think about bias because threats to validity are the key 3
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Experimenter Bias when the beliefs and/or expectancies (conscious or otherwise) of the experimenter influence the results e.g., the experimenter knows that Condition A is predicted to produce higher scores than Condition B the experimenter, wittingly or unwittingly, behaves in a manner that could raise scores in Condition A as compared with Condition B since experimenter behavior is correlated with condition, it’s a confound 4
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Experimenter Bias when the beliefs and/or expectancies (conscious or otherwise) of the experimenter influence the results e.g., the experimenter knows that Condition A is predicted to produce higher scores than Condition B the experimenter, during statistical analysis, sets the upper cutoff for omitting a score as an “outlier” lower in Condition B, since these scores are expected to be lower Condition B data: 8, 1, 3, 4, 2 … drop the 8 … mean = 2.5 5
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Experimenter Bias
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This note was uploaded on 04/29/2010 for the course PSYCH 002 taught by Professor Freeman during the Spring '08 term at University of Iowa.

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bias - 031:010 - Research Methods in Psychology Spring,...

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