Slide 1. Slide 2. Slide 3. Behavioral Research Chapter 10. Simple designs. Factorial design. Complex Experimental Designs
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1 Slide 1 Behavioral Research Chapter 10 Complex Experimental Designs Slide 2 Simple designs Composed of one indep var that is manipulated with two levels and one dep var which is measured. Example: IV: Stress vs. no stress (control) Both measured by a test of cognitive function Hypothesis: The affects of stress impair cognitive function stress as well as cognitive function would have to be operationally defined as to what was used as a stressor (IV) and what measurement did one use to measure cognitive function (DV) Slide 3 Factorial design Designs with more than one indep var or factor. all levels of each indep var are combined with all levels of the other indep var The simplest type of factorial design is a 2 X 2 has two indep var, each having two levels.
2 Slide 4 Example: 2 X 2 Indep var 1: difficulty of the task easy or hard Indep var 2: attitude of the confederate helpful or mocking Dep var: performance on a cognitive task Slide 5 Four Experimental Conditions for 2 X 2 Factorial Design Easy task helpful confederate Easy task mocking confederate Hard task helpful confederate Hard task mocking confederate Slide 6 Interpretation of Factorial Designs Main Effect The impact of each IV on the DV. -The number of main effects depends on the number of Independent Variables. InteractionThe effect of any combination of two or more IV. on the D.V.. The effect that an independent variable has on the dependent variable depends on the level of the other independent variable.
3 Slide 7 Example: Factorial design Examining the after-effects of exposure to an irritating noise on several behavioral measures as a measure of frustration: Two levels of each independent variable Hypothesis: IV one: Irritating noise: loud vs. soft IV two: Predictability: predictable vs. non predicable DV: Number of attempts at difficult puzzle during different noise levels Slide 8 Noise intensity vs. Predictability Loud Soft Predictable Group 1 Group 2 Unpredictable Group 3 Group 4 Slide 9 Noise intensity vs. Predictability Loud Predictable 7 8 Unpredictable 3 5 Soft
4 Slide 10 Calculating Main Effects: Comparing Row and Column Means Column Means: Loud= 5 Soft = 6.5 Row Means: Predictable = 7.5 Unpredictable = 4 Slide 11 Interpretation of Main Effects A reliable difference in the column means would indicate an effect of noise intensity, independent of noise predictability A reliable difference in the row means would indicate an effect of noise predictability, independent of noise intensity Slide 12 Interactions Number of attempts to solve the difficult puzzle was greater when the noise was soft than when it was loud. However, this relationship was dependent on whether the noise was unpredictable
5 Number of puzzle attempts Slide 13 Effects of Predictable vs. Unpredictable Loud vs. Soft Noise on Puzzle Attempts Predictable Unpredictable 2 0 Loud VS. Soft Slide 14 Factorial Designs With Manipulated and Nonmanipulated Variables: IV X PV Designs allow researchers to investigate how different types of individuals respond to the same manipulated variable E.g., of Participant variables gender, age, ethnic group, personality characteristics The simplest IV X PV design includes one manipulated independent variable with at least two levels and one Participant variable with at least two levels E.g., Participant variable two different age groups; or males vs. females Slide 15 IV X PV design, Furnham, Gunter, Peterson (1994) Showed that the ability to study with a distracting task in the room is affected by whether you are more extraverted or introverted Manipulated var distraction Subject var extroversion or introversion Measured var reading comprehension A repeated measures design was used college students read material in silence and within hearing range of a TV program
6 Slide 16 Results Overall, students had higher comprehension scores when they studied in silence Interaction between extraversion and distraction Without a distraction, the performance of extraverts and introverts was the same However, extraverts performed better than introverts when the TV was on. Slide 17 Further Considerations in Factorial Designs If you were to have a 2 x 2 x 2 factorial design, you could look at it as two 2 x 2 designs. E.g., 2 (instruction method: lecture or discussion) x 2 (class size: 10 or 40) x 2 (gender) Divide 2 x 2s by gender 2x2 for males and 2x2 for females Could then look at the main effects and interactions within each of these 2 x 2s )(three main effects) gender lecture vs. discussion class size (small=10; large= 40) Slide 18 Interactions in a 2 X 2 X 2 Could also look at the interaction in the 2 x 2 x 2 design have the possibility of 3 simple interactions Instruction method and class size Instruction method and gender Class size and gender» Could also have a three-way interaction, where the effect of the interaction b/t two of the variables differs depending on the particular level of the third variable» Three-way interactions are complicated and hard to interpret
7 Slide 19 F-Statistic Used in Factorial Designs Is an extension of the t-test. It is an analysis of variance that is a more general procedure than the t-test. When a study has only one independent variable and only two groups using an F or a t makes no difference. However analysis of variance (ANOVA) is conducted when there are more than two levels of an independent variable and when a factorial design with two or more independent variables is used. Slide 20 Therefore, the f-test is appropriate for the simplest experimental design as well as more complex. T-test demonstrates the relationship between two groups and the within group variability F test is the ratio of two types of variance: Sytematic variance: deviation of the group means from the grand man which is the mean score of all individuals in all groups. (Grand mean-5.75: Loud=5, Soft = 6.5) Is small when the differences between group means is small and increases as the group mean differences increase Error variance: the deviation of the individual scores in each group from their respective group mean. Slide 21 F-Significance Ratio of Systematic variance over Error Variance. Therefore you want systematic variance (difference between groups as shown by comparing grand mean to group means) to be high. Error variance to be low (comparison of individual scores against the group mean) Low error variance indicates homogeneity within your groups which will increase your F statistic and be more likely to show significant results.
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