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标题: 1996~2005 scale [打印本页]

作者: nidm 时间: 2007-1-18 12:01
标题: 1996~2005 scale
http://www.powerscore.com/lsat/help/correct_targeted.htm

Historical
Range of Correct Answers for Targeted Scores

Students preparing
      for the LSAT often wonder exactly how many correct answers are required
      to obtain a particular score. The chart below lists the number of correct
      answers needed to achieve scores from 150 to 180 (in five-point increments)
      on every released test over the last eight years.

LSAT	150	155	160	165	170	175	180
December 1996	55	64	72	80	87	93	98
February 1997	54	62	70	79	86	93	98
June 1997	56	65	74	82	89	94	99
October 1997	55	63	71	78	84	90	96
December 1997	56	64	72	80	87	93	99
June 1998	56	65	73	82	89	94	99
September 1998	56	64	72	80	87	93	98
December 1998	54	62	70	78	85	91	97
June 1999	54	63	71	80	88	94	99
October 1999	56	65	73	82	89	94	99
December 1999	55	63	72	79	87	93	98
June 2000	56	65	73	81	87	93	98
October 2000	55	64	72	80	87	93	98
December 2000	54	63	72	80	87	93	98
June 2001	57	66	74	81	88	93	98
October 2001	57	66	74	82	89	***	99
December 2001	57	66	74	82	89	95	99
June 2002	57	67	76	84	91	96	100
October 2002	57	66	74	82	88	93	98
December 2002	55	63	71	80	88	94	99
June 2003	58	67	76	84	91	***	99
October 2003	58	67	75	83	89	94	99
December 2003	56	66	75	83	90	95	99
June 2004	58	67	75	82	89	94	99
October 2004	60	68	76	84	90	***	98
December 2004	56	65	73	81	87	92	97
June 2005	61	69	77	84	90	94	98
October 2005	59	68	77	84	90	95	99
December 2005	58	68	78	86	93	97	100

Averages	56.41	65.21	24)" class="xl29"> 73.52	81.48	88.31	93.58	98.45

Standard
Deviation

1.76

1.93

24)" class="xl29">

2.15

1.99

1.89

1.42

0.87

***
      Indicates that there was no raw score capable of producing that scaled
      score for this test.

One of the more noticeable
      trends in the above chart is that, depending on the test year, different
      raw scores translate into equivalent scaled scores. The reason for this
      apparent discrepancy is that the LSAT varies slightly in difficulty each
      administration. To account for these variances in test "toughness,"
      the test makers adjust the Scoring Conversion Chart for each LSAT in order
      to make similar LSAT scores from different tests mean the same thing.
      For example, the LSAT offered in June of a given year may be logically
      more difficult than the LSAT offered in December, but by making the June
      LSAT scale "looser" than the December scale, a 160 on each test
      would represent the same level of performance.

Test takers can draw
      important conclusions about their own performance from both the average
      raw scores and the standard deviations. For instance, though the average
      raw score corresponding to a scaled 160 is 73.52, the standard deviation
      shows that a majority of the scores are within ± 2.15 of this number,
      or from roughly 71 to 75. A student wishing to score 160 on an upcoming
      test should then expect, with a reasonable degree of confidence, that
      correctly answering somewhere between 71 and 75 questions correctly would
      result in that score. Similar conditions apply for a score of 170, where,
      with the standard deviation adjustment, a raw score between roughly 86
      and 90 is likely needed.

    Perhaps most important
      of all for the potential test taker is to realize that achieving a desired
      score does not require perfect performance. Each of the raw scores above
      is the number correct out of 99, 100, or 101 questions (the October 1997
      test had one question withdrawn after the test was administered; the October
      2004 test had only 100 questions; December 2004 and June 2005 tests had
      only 100 questions and then one question was withdrawn after the test
      was administered; and the October 2005 test had only 100 questions), so
      it is clear that missed questions, within reason, are acceptable regardless
      of the desired score. Even perfect scores usually allow for two or three
      incorrect answer choices. Again, the averages and standard deviations
      listed are useful tools in determining an acceptable number of missed
      questions, whether setting pre-test objectives or evaluating your performance
      in the week following the LSAT when scores may still be cancelled.

作者: madcat 时间: 2007-1-20 10:13
THANKS!

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