The NCLB (No Child Left Behind Act) specifies that states must develop AYP (adequate yearly progress) statewide measurable objectives for improved achievement by all students, including economically disadvantaged students, students from minority races, students with disabilities, and students with limited English proficiency. By the 2013-2014 school year, all students must be at the proficient level or above. Many factors could be possible reasons of variation in percentages of schools fail to make AYP. The purposes of this paper are employing the statistical analysis to identify factors which can explain the variation of percentages fail to make AYP under NCLB regulations. The correlation and regression analysis are used to examine the degree of relationship between these factors. (Contains 2 tables and 1 figure.)