Quantitative
Analysis:
Describes assessments and variables used in
analysis
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STUDENT ACHIEVEMENT
Reading and mathematics achievement tests were administered
to students in the first and second grades who participated
in the target school program. A pretest was given
to students in early fall 1997 and a posttest was
administered in late spring 1998. Over 300 first-graders
at four schools across twenty classrooms and
approximately 250 second-graders at three schools
across fourteen classrooms participated in the
achievement testing. Students with missing or incomplete
data were excluded from the analyses. The following
sections provide scaled scores, percentile ranks,
and stanines. Scaled scores are raw scores that have
been converted to make scores in a given content area
comparable from form to form and level to level. Percentile
ranks range from a low of 1 to a high of 99 and indicate
the percentage of the reference group obtaining scores
equal to or less than that score. The reference group
is a national sample of students at the same grade
taking the test at a comparable time of the year.
A percentile rank of 50 denotes average performance.
Stanines are derived from percentile ranks and also
indicate a student's relative standing in a reference
group. Stanines are normalized, standard scores that
range from a low of 1 to a high of 9. A stanine of
5 denotes average performance. An assumption made
in these analyses is that while a student's scaled
scores should significantly increase in any given
school year, a student's standing in relation to the
reference group should not significantly change between
the fall and the spring.
First Grade Achievement.
Table 8 (contact
Delaware Challenge Project) provides the mean scaled
score, percentile rank, and stanine by semester for
first grade reading and mathematics achievement. As
would be expected in any given academic year, student
scaled scores on both the reading and mathematics
achievement tests increased significantly from the
pretest to the posttest. Because no local comparison
group was available, the analysis of the gains in
student achievement over the school year is based
primarily on norm-referenced scores. Unlike scaled
scores, one would not necessarily expect significant
gains in norm-referenced scores over the course of
the school year.
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