When test scores seem too good to believe

…Such anomalies surfaced in Washington, D.C., and each of the states — Arizona, California, Colorado, Florida, Michigan and Ohio — where USA TODAY analyzed test scores. For each state, the newspaper obtained three to seven years’ worth of scores. There were another 317 examples of equally large, year-to-year declines in an entire grade’s scores….

http://www.usatoday.com/news/education/2011-03-06-school-testing_N.htm?sms_ss=twitter&at_xt=4d7420d42380d6b0,0