SRI-Teknisk rapport-sen.v13 - DPU

D.3 What is the proportion of those selected for
the study who actually participated in the study?
School sample for mathematics and language arts
(reading and writing).
Seventy-two elementary schools and 36 middle
schools were selected to participate
in the study, with alternate schools identified as
potential replacements for
schools whose administrators declined the offer to
participate.
School sample for science and social studies.
One hundred twentysix elementary schools and 63
middle schools were selected to participate in the
study, with alternate schools identified as potential
replacements for schools
whose administrators declined the offer to participate.
Final sample for the study.
As a result of questionnaire nonresponse, the
linking of the questionnaire data to the mean scale
scores for schools reduced the sample sizes. The
final samples for this study consisted of 86 of 90
schools for mathematics and language arts (reading
and writing), 116 of 161 schools for science,
and 111 of 161 schools for social studies. The samples
for science and social
studies were reduced disproportionately more than
for the other content areas
because both teacher and student questionnaire
data were linked to science and social
studies MSPAP performance data (listwise deletion).
Less reduction in the
sample would have occurred if only teacher questionnaire
data were analyzed with
the science and social studies performance data.
However, student evidential variables
could not have been examined.
Explicitly stated (please specify)
School sample for mathematics and language arts
(reading and writing)
The final sample consisted of 59 elementary schools
(82% participation) and 31 middle schools
(86% participation), for a total of 90 schools. Of the
59 elementary schools,
42 were from the initial 72 that were sampled, and
of the 31 middle schools,
22 were from the initial 36 that were sampled. The
remaining schools were from
the list of alternate schools for each classification
cell. This sample represented
schools from 19 of 24 systems or counties in Maryland,
and there were approximately
101