<p>The title says it all. I was wondering how meaningful scores are, and what the spread is. The same for SAT II's. Does the College Board publish this information?</p>
<p>Also, what's the spread in score for people retaking the same test? Is this published?</p>
<p>I hoping you understand what standard deviation is, or have taken an advanced statistics class. Otherwise, there’s no real point in finding it…</p>
<p>So if you are really interested in it for good reason, I’ll lead you through the simple steps that you can use to acquire the deviation yourself.</p>
<p>You know that 1 deviation on each side is 68 percent overall… Because the left half of the bell curve is ENTIRELY included in the percentile calculation, you have 50 percent already included. To find the 1 standard deviation mark, you would have to know 50 + 1/2 (68) = 84.</p>
<p>Then… find what score corresponds to the 84th percentile. Take this score and subtract the mean (1511)… to get… 1 deviation!</p>
<p>If that made absolutely no sense to you than there’s no reason why you should need the STD to begin with.</p>
<p>Given the percentile ranks, it’s actually really pointless to try and figure out the st dev… since st dev is just a poor approximator of the percentile ranks to begin with.</p>
<p>Yes, the College Board publishes all sorts of statistics. I’m sorry I can’t give you a direct link, but you can take a look at the “Professional” section of the College Board website.</p>
<p>Uh, that’s one way to look at it, or you can explain it as 500 is the mean and 100 is a standard deviation, so a score of 700 is two standard deviations above the mean.</p>