Figure 8. Percentage of 8th-grade students reaching the TIMSS international benchmarks in science, by education system: 2011
# Rounds to zero.
*p<.05. Percentage is significantly different from the U.S. percentage at the same benchmark. 1 National Defined Population covers 90 to 95 percent of National Target Population (see appendix A). 2 Nearly satisfied guidelines for sample participation rates after replacement schools were included. 3 National Defined Population covers less than 90 percent, but at least 77 percent of National Target Population (see appendix A). 4 National Target Population does not include all of the International Target Population (see appendix A). 5 Exclusion rates for Georgia are slightly underestimated as some conflict zones were not covered and no official statistics were available. 6 The TIMSS International Study Center has reservations about the reliability of the average achievement score because the percentage of students with achievement too low for estimation exceeds 15 percent, though it is less than 25 percent.
NOTE: Education systems are ordered by percentage at Advanced international benchmark. Italics indicate participants identified and counted in this report as an
education system and not as a separate country. The TIMSS international median represents all participating TIMSS education systems, including the United States,
shown in the main part of the figure; benchmarking education systems are not included in the median. Participants that did not administer TIMSS at the target grade
are not shown; see the international report for their results. All U.S. state data are based on public school students only. The tests for significance take into account the
standard error for the reported difference. Thus, a small difference between the United States and one education system may be significant while a large difference
between the United States and another education system may not be significant. The standard errors of the estimates are shown in table E-29 available at http://nces.ed.gov/pubsearch/pubsinfor.asp?pubid=2013009.
SOURCE: International Association for the Evaluation of Educational Achievement (IEA), Trends in International Mathematics and Science Study (TIMSS), 2011.