Dennis said
other than being able to say that the experimental group ... ON AVERAGE ...
had a mean that was about 1.11 times (control group sd units) larger than
the control group mean, which is purely DESCRIPTIVE ... what can you say
that is important?
However, can you say even that unless it is ratio scale?
OTOH, there is a two standard deviation difference, which is large enough to
practically hit you over the head. The significance test is more important
when the effect is smaller because small effects are much more likely to be
chance events.
Paul R. Swank, Ph.D.
Professor
Developmental Pediatrics
UT Houston Health Science Center
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