Chapter_11_-_Factorial_Designs

Chapter_11_-_Factorial_Designs - PSYC 310 Chapter 11...

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Factorial Designs Factorial Designs PSYC 310 – Chapter 11 PSYC 310 – Chapter 11
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Factorial Designs Factorial Designs The methods we have been considering so far allow us to examine the relationship between one IV and one DV. When there is more than one IV in a study, we refer to the IVs as factors. the effects of more than one IV on a given DV the interactions between the IVs - combined effects A factorial design allows us to examine:
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Factorial Designs Factorial Designs Used often in psychological research because human behavior is complex in nature and influenced by a variety of interacting factors. Factorial designs have ecological (real world) validity and thus high external. Factors contributing to a poor exam outcome: bad mood argument w/partner lack of sleep not studying enough
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Factorial Designs Factorial Designs We could examine each factor in a separate experiment: Or we can consider both questions in one factorial study: 1. Effects of sufficient / insufficient sleep on exam performance. 2. Effects of sufficient / insufficient study time on exam performance. 3. What are the combined effects of sleep time and study time on exam performance?
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Factorial Designs Factorial Designs In this example, there are two factors (sleep time and study time) and each factor has two levels (sufficient versus insufficient). Each factor is denoted by a letter and each level of the IV is represented by a number. sufficient sleep insufficient sleep sufficient study insufficient study Factor A Factor B A1B1 A1B2 A2B1 A2B2
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Factorial Designs Factorial Designs sufficient sleep insufficient sleep sufficient study insufficient study Factor A Factor B sufficient study insufficient study sufficient sleep insufficient sleep Study Sleep 2 x 2 factorial design = 4 cells
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Factorial Designs Factorial Designs When you have two factors and two levels for each, you have a 2 x 2 factorial design. The number of digits indicates how many IVs there are in your study and the actual value of each digit indicates how many levels there are for each IV. 2 x 3 2 x 2 x 3 Factor A Factor B 2 levels 3 levels Factor A Factor B 2 levels 2 levels Factor C 3 levels
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Factorial Designs Factorial Designs recall happy recall sad learn happy learn sad Factor A Factor B A1B1 A1B2 A2B1 A2B2 What is the effect of mood on memory? Does it matter more at learning or at recall?
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Factorial Designs Factorial Designs recall happy recall sad learn happy learn sad Factor A Factor B learn happy learn sad recall happy recall sad Learn Recall 2 x 2 factorial design
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Factorial Designs High trait Med. trait test anxiety no test anxiety Factor A Factor B A1B1 A1B2 A2B1 A2B2 What are the effects of anxiety on test performance? Single studies yield confusing results.
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Chapter_11_-_Factorial_Designs - PSYC 310 Chapter 11...

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