Abstract :
This research aimed to know The Effect Learning Group Investigation
(GI) Toward Solve problem Ability with Lesson Study Students Tenth Graders of
MA Rhabitussa’adah in School Years 2018/2019. Lesson Study three phase that is
Plan, Do and See. At phase of Plan model teacher plan topic to be taught by
during study process, phase of Do that is study according to phase and planning of
See is activity of refleksi of planning process and execution of study.
The research was experimental research using Quasy Experimental
Design. The population were students of the tenth graders of I Semester, there
were 2 classes cosisting of 37 students. Futhermore, The sample was the grader of
IPA as experimental class and IPS as control class using simple random sampling
technique. The instrument in this research was the Solve problem ablity test in the
form of essay test which amounts to 8 items.
Based on the data analysing, the average value of post-test experimental
class was 74.2 and control class was 66.17. Meanwhile, hypothesis test used
statistical analysing with the t-test formula at the level of 5% confidence was
obtaining tcount of 3.418. After comparing with ttable 1.690, tcount 3.418> ttable 1.690,
so the conclusion in this research showed good effect Learning Group
Investigation (GI) toward Solve problem Ability With Lesson Study Students
tenth graders of MA Rhabitussa’adah in school years 2018/2019.
Keywords: Group Investigation, Lesson Study and Solve Problem Ablity