What is the critical value for this analysis, using an alpha of .05?
To study the effects of common drugs on cognitive performance, a researcher randomly assigned college students to one of three conditions. One group of students was served two cans of beer, another group was served two cups of coffee, and the third group (the control group) was served two glasses of orange juice. Then each participant was given a test of logical reasoning and the number of errors was recorded.
Alcohol Caffeine Orange Juice/Control
15 9 6
20 8 4
10 10 10
12 13 11
13 12 6
Ans: 3.89
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