Not understanding "F ratios" very well. can anyone help with this problem?
64 test subjects are divided equally into 4 drug groups to test how many problems they can solve in 10 minutes. Following are the mean and standard deviations for the groups.
Marijuana= mean, 7 SD 3.25
Meth= Mean, 8 SD, 3.95
Valium= mean, 5 SD, 3.16
Beer= mean, 4 SD, 2.07
What would the new valude for calculated F?
What rule relates changes in F ratio to changes in sample sizes?