The judgmental approaches used by the Governing Board to set National Assessment of Educational Progress achievement levels have been the subject of a great deal of controversy and have sometimes led to results that were considered "unreasonable." The NCES requirement that the achievement levels be used on a trial basis and be interpreted with…

The objectives of this research are to (a) compare the trend lines after some adjustments for level and scale only and determine if and how they differ; (b) describe the methodology of each assessment and identify similarities and differences; and (c) attempt to explain any observed differences based on comparable subsets or on special analysis.…

Fundamental to statistical analyses is the comparison of means of one variable from two or more populations. Population samples may be constructed (i.e., experimental and control groups), or they may be natural groupings (i.e., students at a particular grade in different years). If the populations are similar, the mean comparisons are…