In
order to conduct the Scheffe test, one must compare the
two means two at a time, using all possible combinations of means. For example,
if there are three means, the following comparisons must be done:
To find the critical
value F’ for the Scheffe Test,
multiply the critical value for the F test
by k-1:
F’
= (k-1) (CV)
There is a significant difference between the two means
being compared when FS is
greater than F’.
Solution:
The
critical value for F’ at α=0.05,
with d.f.N.=2 and d.f.D.=12, is
F’ = (k-1) (CV)
= (3-1) (3.89)
= 7.78
By: Andrea Beatrice A. Pehueco
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