9. Gravetter/Wallnau/Forzano, Essentials - Chapter 13 - End-ofchapter question 18 In a classic study of the effect of memory on caffeine, Loke (1988) studied the effect of caffeine on the serial position effect. In memory tests, the serial position effect refers to the observation that memory for items at the beginning and end of a list are remembered better than items in the middle of a list. Loke observed an interaction between caffeine dose (low, moderate, and high) and position (lst, 2nd, 3rd, and 4th block) in a list of recalled items. A pattern of results like those reported by the researcher is described in the table below. Factor A: Dose of Caffeine Factor B: Serial Position 1st 2nd 3rd 4th High M=11 M=8 M=11 M=14 Low M= M=4 M=12 M=15 Complete the following ANOVA table. Use an ANOVA with o = .05 to evaluate the data. Note: Round the MS values and the F statistics to three decimal places. Source 55 df MS F Between treatments 224 7 32,000 Factor A (dose of caffeine) 16 1 16000 8000 Factor B (serial position) 170 3 56.670 28335 A x B Interaction 38 3 12.670 6335 Within treatments 144 72 2,000 Total 368 79 What are the critical F values? (Use two decimal places.) What are the critical F values? (Use two decimal places.) F Distribution Numerator Degrees of Freedom = 6 Denominator Degrees of Freedom = 38 O O 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 F F-criticalA 11 F-criticalB F-critical AxB Is there a main effect for factor A? Is there a main effect for factor B? V Is there an interaction? V