12-04 lecture ISS - Lecture 12/04 ISS Rival Hypothesis for...

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Lecture 12/04 ISS Rival Hypothesis for Approach 1: Maturation Sometimes, just the passage of time results in people changing, even without any external cause. Growing up, growing older, growing stronger etc. (Pre)Testing Soemtimes, the very act of measurement itself at pretest can change behavior at posttest (even without any manipulation of the independent variable) For example, in our experiment on effects of TV on aggression in a primitive culture Suppose just the observation of our isolated culture at time 1 invaded their privacy, disrupted their traditions, and led to more conflict aggression Red flags: When the act of measurement/observation is very obtrusive or disruptive or unexpected When the interval is short (so testing effect hasn’t worn off) When the dependent variable is an attitude or opinion (pretesting can induce thinking and info search….asking them something they hadn’t thought about, or giving them an opinion they didn’t originally have but now do) When practice with the measure is likely to change scores (e.g. seeing a test before you take it) When “psychological reactance” is likely (i.e. people want to establish their independence from researchers) e.g. studies of conformity or attitude change Instrument decay or instrumentation Sometimes, the measurement instrument changes in a systemative way from pretest to posttest (a systemative bias in measurement) producing apparent differences when there really are none For example, in our experiment on effects of TV on aggression in a primitive culture
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This note was uploaded on 04/02/2008 for the course ISS 305 taught by Professor Kern during the Winter '07 term at Michigan State University.

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12-04 lecture ISS - Lecture 12/04 ISS Rival Hypothesis for...

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