About the Assessment: Target Population and Sample Size
The schools and students participating in NAEP assessments are selected to be representative of all schools nationally and of public schools at the state level. Samples of schools and students are drawn from each state and from the District of Columbia and Department of Defense schools. The results from the assessed students are combined to provide accurate estimates of the overall performance of students in the nation and in individual states and other jurisdictions.
While national results reflect the performance of students in both public schools and nonpublic schools (i.e., private schools, Bureau of Indian Education schools, and Department of Defense schools), state-level results reflect the performance of public school students only. Results are also reported separately for Department of Defense schools in state tables and maps. More information on sampling can be found in NAEP Technical Documentation.
The sample of students in the participating TUDA school districts is an extension of the sample of students who would usually be selected by NAEP as part of state and national samples. Results for students in the TUDA samples are also included in state and national samples with appropriate weighting. For example, the results reported for Chicago are included as part of the results reported for Illinois and for the nation. Since approximately 20 percent of Illinois’ students are in Chicago, the TUDA results for Chicago are weighted to comprise 20 percent of the results for the state.
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| State/jurisdiction | Sample size | Target population |
|---|---|---|
| Nation | 173,300 | 3,824,000 |
| Public | 167,300 | 3,485,000 |
| Private | 2,800 | 330,000 |
| Alabama | 2,700 | 56,000 |
| Alaska | 2,600 | 9,000 |
| Arizona | 3,100 | 78,000 |
| Arkansas | 2,800 | 37,000 |
| California | 7,600 | 444,000 |
| Colorado | 2,700 | 55,000 |
| Connecticut | 2,800 | 41,000 |
| Delaware | 2,900 | 9,000 |
| Florida | 4,800 | 186,000 |
| Georgia | 4,100 | 117,000 |
| Hawaii | 2,800 | 13,000 |
| Idaho | 3,100 | 21,000 |
| Illinois | 4,300 | 146,000 |
| Indiana | 2,800 | 76,000 |
| Iowa | 2,900 | 34,000 |
| Kansas | 3,100 | 34,000 |
| Kentucky | 3,900 | 48,000 |
| Louisiana | 3,000 | 53,000 |
| Maine | 2,700 | 13,000 |
| Maryland | 3,600 | 56,000 |
| Massachusetts | 3,900 | 71,000 |
| Michigan | 3,500 | 117,000 |
| Minnesota | 3,400 | 62,000 |
| Mississippi | 2,900 | 39,000 |
| Missouri | 2,700 | 63,000 |
| Montana | 2,700 | 10,000 |
| Nebraska | 3,100 | 21,000 |
| Nevada | 3,100 | 32,000 |
| New Hampshire | 2,800 | 15,000 |
| New Jersey | 2,900 | 102,000 |
| New Mexico | 2,900 | 25,000 |
| New York | 4,100 | 194,000 |
| North Carolina | 4,500 | 105,000 |
| North Dakota | 2,100 | 7,000 |
| Ohio | 3,600 | 126,000 |
| Oklahoma | 3,000 | 46,000 |
| Oregon | 2,900 | 39,000 |
| Pennsylvania | 3,800 | 121,000 |
| Rhode Island | 2,500 | 10,000 |
| South Carolina | 3,000 | 53,000 |
| South Dakota | 2,800 | 9,000 |
| Tennessee | 3,000 | 75,000 |
| Texas | 6,500 | 318,000 |
| Utah | 3,400 | 42,000 |
| Vermont | 2,700 | 6,000 |
| Virginia | 3,000 | 86,000 |
| Washington | 3,300 | 75,000 |
| West Virginia | 2,800 | 20,000 |
| Wisconsin | 4,000 | 59,000 |
| Wyoming | 2,000 | 7,000 |
| Other jurisdictions | ||
| BIE1 | 1,100 | 3,000 |
| District of Columbia | 1,900 | 4,000 |
| DoDEA2 | 2,100 | 7,000 |
| 1 Bureau of Indian Education. 2 Department of Defense Education Activity (overseas and domestic schools). NOTE: The sample size is rounded to the nearest hundred. The target population is rounded to the nearest thousand. Data for BIE and DoDEA schools are counted in the overall nation total, but not in the nation (public) total. Data for the District of Columbia public schools are counted, along with the states, in nation (public). Detail may not sum to totals because of rounding. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2009 Mathematics Assessment. |
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Learn more about the sampling design.
