Effect of Caffeine on Finger Tapping
|
0 mg |
100 mg |
200 mg |
|
242
|
248
|
246
|
|
245
|
246
|
248
|
|
244
|
245
|
250
|
|
248
|
247
|
252
|
|
247
|
248
|
248
|
|
248
|
250
|
250
|
|
242
|
247
|
246
|
|
244
|
246
|
248
|
|
246
|
243
|
245
|
|
242
|
244
|
250
|
30 subjects (male college students) were trained in finger tapping. (The source of this data doesn't give a lot of
information, but presumably they were trained to tap a certain number of times per minutes.) After training, they
were randomly divided into three groups, and the groups received different doses of caffeine. (The subjects did not know
what dose they received.)
Two hours later, they were observed tapping their fingers, (presumably) trying to adhere to the training instructions, and the
number of taps per minutes was recorded for each subject.
If it is of interest to determine if caffeine leads to a tendency to tap faster, the Jonckheere-Terpstra test or the
rank test in the spirit of the Abelson-Tukey test (described on p. 88 of Miller's Beyond ANOVA) could be used.