The use of a voucher had no statistically significant impact on overall student achievement in math or reading. (ncpecoalition.org)
He said a number of variables — including charter school enrollment — could affect overall student population by a swing of as much 5,000 to 10,000 students in either direction. (huffingtonpost.com)
The median is a better indicator of overall student performance as it is not affected by relatively few high (or low) performances. (teachermagazine.com.au)