Posted by brenduh on Sunday, March 22, 2009 at 2:09am.
Hmmm. Area? or do you mean the probability? The area under a probability density function is area, so you have a probabliity density x deviation which equals probability. The entire area is 1.00 under the function.
See this applet:http://psych.colorado.edu/~mcclella/java/normal/accurateNormal.html
The area under the curve indicates the probability. Use the Z-score to determine area.
Z = (x - μ )/SD, where x = score, μ = mean, and SD = standard deviation.
Use table in your statistics text called "areas under normal distribution" or the source indicated by bobpursley to get the area from the Z-score.
I hope this helps a little more. Thanks for asking.
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