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Just curious seems like there are a lot of perfect scores 900 in HSAT this year. how many have you heard? thoughts?
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The 900 score is based on percentile rankings (99th percentile in both sections). Only 1% of students receive a perfect 900. Test difficulty doesn’t matter much unless the test is extremely easy or extremely difficult.
For example, the HSAT is exceptionally easy—almost 50% of CPS students achieve perfect scores in both reading and math (meaning they answer every question correctly, not just scoring in the 99th percentile). These students who get everything correct still only receive 99th percentile rankings in both sections. However, the next group of students—even those who miss just one question—don’t receive 98th percentile rankings; instead, they drop to the 50th percentile for reading or math due to the large number of perfect scores.
In summary, the number of students who achieve 99th percentile each year depends on the total number of CPS students taking the HSAT. If 20,000 students take the HSAT, approximately 200 students (1%) will receive a 900.-
I don’t think it’s possible that “almost 50% of CPS students achieve perfect scores in both reading and math.” If that were the case, the data on point totals for the SEHS would look very different. Based on the point assignments for grades in 7th grade, and the ranges of scores by tier for each of the selective enrollment schools, there is clearly a wide range of distinct percentiles in both reading and math. That means a wide range of outcomes for the standard scores. That isn’t consistent with half the students answering every question correctly!
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There is absolutely no way half of CPS students get a perfect score Where do you get this info? Also i know many students who scored 880, 870, 800 for example, which is not possible if half the students are perfect and half are only in the 50% percentile. If you are in the 50% for math and reading the maximum you could score is 678 according to the scoring rubric.
There have been a lot of comments in these threads that seem to lack an understanding of percentiles. There absolutely has to be a 99th percentile, and a 98th percentile, etc. There may be high scores this year (easy test) but the 99th percentile has a variety of standard or raw scores within it – as well as the 98the and 97th percentiles etc. 333 in reading and 317 in math might put you in 99th percentile. 333 in reading and 312 in math may put you in 98th for example.
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The example is hypothetical. If you have 10 students. A test is super easy or super difficult. 5 kids got perfect score or 0 score. There could be some missing percentile scores if there is no specific tie breaker rule. Just extreme cases.
The same logic applies to HSAT. If there are many tied scores in reading or math some of percentile scores are not available.
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sorry. there can be no missing percentile scores. Raw scores are standardized or what is known as normalized. They convert raw scores (correct answers) to a consistent scale that shows how a student compares to the average, adjusting for test difficulty, and these scaled scores are then used with percentiles to determine points for the 900-point admission matrix, with standard scores serving as key tie-breakers. Again, the 99th percentile is the top 1% – that doesn’t mean none of those students didn’t miss a question. There is a range of “standard scores” for each of the math and Reading sections that denotes this top 1% (and so on for different percentiles). This top 1% is the top 1% in relation to the average scores.
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also not everyone who scored 99/99 have 900 because grades is also a factor.
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I thought the SEHS test was nationally normed. That the percentiles are not specific to Chicago 8th graders testing, rather a broader set of US population?
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Our student has a 99/99 and we know of at least five others. But, that doesn’t matter. We might know the same five people you do, and not all kids with a 900 will rank the same school as #1. Some will not even choose CPS in the end–we know several with that score who will apply to CPS, get in, and then choose a private school. Also now ALL CPS 8th graders take the test at school, in addition to many students from private school. So it’s a lot of kids, and only 1% will be in the top 99th percentile, so it’s never going to be an explosive number of students. Don’t stress about that.
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