implementation type coefficient table descriptive student disadvantage learning research center limitation content REVIEW homogeneity vii pedagogical sheet INTRODUCTION appendice RESULT definition CONTENTS normality closing model benefit study DISCUSSION together theory viii central data discussion SUGGESTION difference instrument statistic conclusion PBL variable technique CONCLUSION identification testing operational biography validity relevant objective phase procedure iii sample problem III preparation regression analyzing linearity REFERENCES spread numbered analysi RESEARCH ability between determining IV theoritical cooperative design conceptual advantage significance variance II CHAPTER LITERATURE figure background summary population test step interpretation ANCOVA distribution agreement tendency NHT reliability based preface time framework list METODOLOGY size solving head suggestion effect abstract place hypothesi