What would the new valude for calculated f what rule


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?

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