Exercise 2 Opinions About Whether Caffeine Enhances Test Performance Differ You Design A Study To Test The Impact Of D 1 (60 KiB) Viewed 109 times
Exercise 2 Opinions About Whether Caffeine Enhances Test Performance Differ You Design A Study To Test The Impact Of D 2 (52.93 KiB) Viewed 109 times
Exercise 2: Opinions about whether caffeine enhances test performance differ. You design a study to test the impact of drinks with different caffeine contents on students' test-taking abilities. You choose 21 students at random from your introductory psychology course to participate in your study. You randomly assign cach student to one of three drinks, each with different caffeine concentration, such that there are seven students assigned to each drink. You then give each of them a plain capsule containing the precise quantity of caffeine that would be consumed in their designated drink and have them take an arithmetic test 15 minutes later. You plan to use an ANOVA with a = .05 to test the impact of drinks with different caffeine contents on students' test-taking abilities. The students receive the following arithmetic test scores: Water Coffee Espresso 78 92 83 88 87 83 72 80 76 72 89 79 64 96 86 81 83 79 82 92 81 A) State your null and alternative hypotheses. B) Determine the boundaries for the critical region (i.e., find Ferit).
C) Perform all the necessary computations to populate the ANOVA table below (including T, n, M, EX?, and SS for each treatment, total EX, G, N. and k). (Round your answers to two decimal places.) df MS SS Source Between treatments Within treatments Total Use the table below to help you navigate the computational steps necessary to calculate values needed to populate the ANOVA table above. Water Coffee Espresso k= Σχ2 x2 (total) = N- n T G= M SS SS within SS between SStotal df within df between af total df
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