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On Wed, 26 Dec 2001, John Clement wrote:
> The problem is that I have used some standard jargon from the standard
> educational literature and alluded to some results from that same
> literature.
That does not mean that either "the standard jargon" or the
"results" quoted are using statistical analysis correctly.
>
> Effect size is generally defined as the change in the mean on an evaluation
> divided by the standard deviation of the curve.
OK. You have now defined which standard deviation you are
discussing.
Most of the educational
> literature effect sizes are less than 1.0 and a curriculum which achieves
> anything over 0.5 is usually considered to be very effective.
We're not concerned with "usually". We"re doing straight
mathematics. If the curve is taken to represent an estimate of a
probability distribution, and the distribution is normal, then an effect
size of 1.0 may be interpreted as a 30% chance that the mean did not
change.
.....
regards,
Jack