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) In a study of the effects of caffeine on alertness, 32 subjects were randomly assigned...

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Statistics

) In a study of the effects of caffeine on alertness, 32subjects were randomly assigned to four groups. These groups wereC1: wait-list control (no treatment), C2: placebo control, E1:experimental group 1 (mild caffeine treatment) and E2: experimentalgroups 2 (high caffeine treatment). Several subjects were not ableto complete the study, reducing the group n’s to 7, 5, 6, and 3,respectively. The dependent variable scores were performance scoreson a visual-motor task requiring alertness. The results are asfollows:

C1C2E1E2
18202532
16182226
15151920
141217
131014
1211
10

Do the results indicate a significant difference betweentreatment groups? State the null hypothesis, Fcritical, η2, and useScheffe’s test to determine which treatment conditions differ inthe event of rejecting the null hypothesis. Conclude with a summaryappropriate for publication.

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