Figure 3. Percentage of U.S. fourth- and eighth-grade students who reached each TIMSS international science benchmark compared with the international median percentage: 2007
*p < .05. U.S. percentage is significantly different from the Trends in International
Mathematics and Science (TIMSS) international median percentage.
NOTE: The United States met guidelines for sample participation rates only after
substitute schools were included. The National Defined Population covered 90
percent to 95 percent of National Target Population. The TIMSS
international median represents all participating TIMSS jurisdictions, including the
United States. The international median represents the percentage at which half
of the participating countries have that percentage of students at or above the
median and half have that percentage of students below the median. The
standard errors for the estimates are shown in table E-24 available at http://nces.
SOURCE: International Association for the Evaluation of Educational Achievement
(IEA), Trends in International Mathematics and Science Study (TIMSS), 2007.