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version 1.10, 2008/02/22 19:22:21	version 1.11, 2014/05/27 18:06:24
Line 41 there were no attempts made on the probl	Line 41 there were no attempts made on the probl

The students are grouped based on their scores on the sequence which	The students are grouped based on their scores on the sequence which
contains the homework problem. The percent score of the bottom 25\% of	contains the homework problem. The percent score of the bottom 25\% of
the students is subtracted from the percent score the to top 25\% of	the students is subtracted from the percent score of the top 25\% of
the students. This yields a number from -1 to 1. 1.0 indicates	the students. This yields a number from -1 to 1. 1.0 indicates
all of the good students answered the problem correctly and none of the	all of the good students answered the problem correctly and none of the
poor students answered it correctly. Conversely, a score of -1.0 indicates	poor students answered it correctly. Conversely, a score of -1.0 indicates