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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: Statistics Question
A "normal" distribution makes it easy to interpret scores - if you know the score you know what percentage of test-takers scored above and below that point. This is why the distribution of raw scores is "normalized" during the process of preparing the scaled scores used in reporting the results of standardized tests. A "uniform" or "rectangular" distribution is one in which all outcomes have the same probability of occuring. (The outcomes of rolling a fair die are one example.) Percentile ranks are sometimes (sloppily) said to follow a rectangular distribution. Art >>> eddie185@YAHOO.COM 01/28 12:36 PM >>> To: ARN-L My statistical comprehension is apparently (based on NY State's definition) only a "2" (Does Not Meet Standard). In an effort to understand what "norm-referenced" means, I have a (perhaps naive) question. Don't the people who construct standardized, norm-referenced exams seek to atttain a bell-shaped curve when they norm the tests on a sample group prior to selling the test to the public? And, how is a rectangular (AKA "uniform") distribution possible if a test is "properly" normed? Thanks in advance to the person or persons who help me out of this quandary. ===== Edward J. Levine, Ed.D. NYC Board of Education 110 Livingston St. (306A) Brooklyn, NY 11201 email: elevine@nycboe.net phone: (718) 935-3044 ===== Edward J. Levine, Ed.D. NYC Board of Education 110 Livingston St. (306A) Brooklyn, NY 11201 email: elevine@nycboe.net phone: (718) 935-3044 __________________________________________________ Do You Yahoo!? Great stuff seeking new owners in Yahoo! Auctions! http://auctions.yahoo.com -------------------------------------------------------------------------- To unsubscribe from the ARN-L list, send command SIGNOFF ARN-L to LISTSERV@LISTS.CUA.EDU. -------------------------------------------------------------------------- To unsubscribe from the ARN-L list, send command SIGNOFF ARN-L to LISTSERV@LISTS.CUA.EDU.
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