This student’s selection index is 809x2=1618. The sum of the scaled scores is 35+34+740= 809. Ok, let’s assume they gave us the scaled scores because we are meant to use them. What is a “score”? Is it the raw score or the scaled score? Doesn’t say. The booklet reads (on page 55): "“The selection index is calculated by doubling the sum of the reading, writing and language, and math test scores.” Hmm. Now I’m going to follow the instructions in my daughter’s sample test booklet to calculate this student’s “selection index”. The raw math score is a 43, that becomes a 740. The raw writing score is a 39, that becomes a 34. After clicking around a little, you can find the scoring booklet at Using the chart on page 7, it says that the raw reading score is a 42, that becomes a 35. Let’s look at the scoring for a kid who missed 5 questions in each section of the practice test. A score of 400, for instance, on one day’s test means the same thing as a 400 on a test taken on a different day - even though the questions are different."īut where is the percentile information for the practice test? Absent percentile information, scaling is arbitrarily mapping one number into another. The College Board uses equating to make sure there’s no advantage in taking the test on a particular day. Equating adjusts for slight differences in difficulty between various versions of the test (such as versions taken on different days). The college board says, " Raw scores are converted to scores on a scale of 160 to 760 using a process called equating. I am saying this entire test appears to have been rushed into place and thrown together in too much of a hurry and that the scaling and grading are somewhat suspect. Anyway, If you only missed a couple then you are probably ok regardless. (And I realize that you were referring to a real PSAT not the SAT practice tests but hopefully you can glean some insight from this). So, - does that answer your question? I wish it were a bit more consistent. So for a real test I’d say at this point there is even more a priori uncertainty. And golly but these norms aren’t even based on historical data exactly! (for the PSAT they say they used “research data” to determine the norms and I’m guessing it’s the same for the SAT). For instance a score of 700 is at the 93rd percentile: That might mean a raw score of 48 - 50 or a score of 43, based on these conversion tables. What particular raw score converts to that test score certainly can. converted score) really don’t change from test to test. Keep in mind that the percentiles as determined by test score (i.e. If you miss 11, the scores swing from 690 to 740 If you miss 4, the converted score is 750-760 for tests 1 - 3 and 780 for test 4 If you miss 1, the converted score is 790 for tests 1 - 3, and 800 for test 4 Using Math as a good example (Raw score max = 58 in all cases): So, all this talk about raw scores had ME curious about something - we have four new practice SAT’s and conversion tables for each of them.
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