【多选题】In an experiment of Cr(VI) removal by an ion-exchange technique, there were 5 levels of factor pH, pH=3.0, 5.0, 7.0, 9.0, 11.0. Under each pH level, the Cr(VI) removal treatment was triplicate, that i...
A.
Mean square (MS) can be expressed as the sum of squares divided by the degree of freedom.