Digest of Education Statistics: 2004
Digest of Education Statistics: 2004

NCES 2006-005
October 2005

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Table A-5.Sampling errors (95 percent confidence level) for the difference in two percentages estimated from the Gallup Poll: 1992, 1993, and 1996 to 2004 

___________________________________________________________________
                               |         Size of second sample
Size of first                  |___________________________________
sample                         |1,500|1000 | 750 | 600 | 400 | 200
_______________________________|_____|_____|_____|_____|_____|_____
Recommended allowance for      |     |     |     |     |     |
   sampling error of a         |     |     |     |     |     |
   difference percentages      |     |     |     |     |     |
   (percentages near 80 or 20) |     |     |     |     |     |
  1,500 .......................|    4|    4|    5|    5|    6|    8
  1,000 .......................|    4|    5|    5|    5|    6|    8
  750 .........................|    5|    5|    5|    6|    6|    8
  600 .........................|    5|    5|    6|    6|    7|    8
  400 .........................|    6|    6|    6|    7|    7|    9
  200 .........................|    8|    8|    8|    8|    9|   10
                               |=====|=====|=====|=====|=====|=====
Recommended allowance for      |     |     |     |     |     |
   sampling error of a         |     |     |     |     |     |
   difference in percentages   |     |     |     |     |     |
   (percentages near 50)       |     |     |     |     |     |
  1,500 .......................|    5|    5|    6|    6|    7|   10
  1,000 .......................|    5|    6|    6|    7|    8|   10
  750 .........................|    6|    6|    7|    7|    8|   10
  600 .........................|    6|    7|    7|    7|    8|   10
  400 .........................|    7|    8|    8|    8|    9|   11
  200 .........................|   10|   10|   10|   10|   11|   13
_______________________________|_____|_____|_____|_____|_____|_____

SOURCE: Phi Delta Kappa, Phi Delta Kappan, "The Annual Gallup Poll of the Public's Attitudes Toward the Public Schools," 1992,1993, and 1996 to 2004.


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