classe objective teacher option IPA there item state 906 teaching senior students' formula taught student' 082188310037 science proces applied result registration student text wa learning medan interaction research improve between program linguistic cooperative design using multiple grade chosen kuder factorial namely university higher competence ANOVA ABSTRACT significant ftable natural fobserved ievement choice narrative language analyzed experimental cluster way measured study number richardson' population investigate increase suggested varietie implie english sampling reading low reliability based thesi school apply than effective syarifah I0 data task medal whether 2011 conclusion two aini achievement XI technique ofmedan method effect high