Based upon a comparison of pre-test and post-test scores, the researcher
discovered that there were changes in the student's scores on the NNAT depending upon
the treatment received, and that the variation in scores differed across the four grade
levels. The researcher found that across all four grades, the student's experienced a
modest increase in scores, which included all three treatment groups. This in itself is not
indicative of significant gains as the post-test NNAT comprised the same material as the
pre-test, which included two additional weeks between testing, (the publisher's
recommendation is a minimum of 12 weeks between tests for the group administered
instrument).