All- New York State Data Center (SDC) staff (Leonard M. Gaines and Bob Scarmadalia) developed an excellent MS Excel spreadsheet tool to calculate statistical significance of differences and margins of error for calculations using data from the American Community Survey. Please feel free to use the worksheets in the attached MS Excel Spreadsheet (StatisticalCalculationsMenu_V21.xls). http://www.census.gov/acs/www/Products/users_guide/ACS_2005_Statistical_Tes… Any feedback would be appreciated by NY SDC (LGAINES(a)EMPIRE.STATE.NY.US). Thank you Nanda Srinivasan