Comm 88 Notes 11 19

Comm 88 Notes 11 19 - Communication 88 Lecture 11-19 Within...

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Communication 88 Lecture 11-19 Within – subjects experiments (repeated measures) So far, we’ve done “between subjects” designs (randomly assign Ss (subjects) to different conditions) Within-Ss Design o Every subject is in every condition Ss serve as their own control group o Example: Pilots’ reaction time to warning lights Possible Between Ss design, with 18 pilots (posttest only study) R X (red) O 1 (reaction time) [group 1] R X(green) O 1 (reaction time) [group 2] R X (yellow) O 1 (reaction time) [group 3] Problems – small N’s; random error As a Within Ss design: Each pilot sees each light o 1 st ) red light -> reaction o 2 nd ) green light -> reaction o 3 rd ) yellow light -> reaction time Now: N=18 in each condition (increase power; decrease error) Problem: carry-over/order effects (the order in which you do things effects the outcome) o Practice effect (faster/better over time, doing a task, reacting to things) o Fatigue effects
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This note was uploaded on 01/25/2011 for the course COMM 88 taught by Professor Jansma during the Spring '08 term at UCSB.

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Comm 88 Notes 11 19 - Communication 88 Lecture 11-19 Within...

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