classe objective investigating sample instructional IPA into state teaching direct selected applying formula taught coefficient era word table result keyword text student wa medan research KR lumbanraja significantly control design academic using grade comprehension other significance university higher freedom ABSTRACT obtained SMA level 2015 language faculty analyzed divided calculation alternative experimental used study affect population test inference writer analytical art sampling reading random while reliability thesi group accepted negeri degree strategy reliable 2113121022 than determine data showed conducted prediction 2016 two XI aim observed mean exposition enjelyna effect year hypothesi