International Journal of Academic and Applied Research (IJAAR)   Year: 2022 | Volume: 6 | Issue: 12 | Page No.: 102-105 Effects of Cooperative Learning and Lecture Instructional Approaches (Clia and Lia) On Conceptual Change of Chemistry Students in Delta North Senatorial District Download PDF OKOBI, Chinwe Esther and Prof. O. P. Ajaja Abstract: Effects CLIA and LIA on conceptual change of chemistry students in Delta North Senatorial District were examined in this study. The study adopted planned variation group quasi-experimental design. The population for the study consisted of 6, 725 students. 302 SSII students made up the sample. Two-Tier Chemistry Test (TTCT) was the study's instrument. Three professionals face-validated TTCT. TTCT had 0.79 reliability value established using Kuder-Richardson formula 21. t-test and ANCOVA were used to analyse the students' scores obtained from pre- and post-tests. The results showed significant difference between the mean conceptual change scores of students taught chemistry using CLIS and LIA, in favour of CLIS. The conclusion drawn based on the findings of the study is that CLIS has a relative advantage and bears more beneficial boost than LIA in enhancing students' conceptual change in chemistry. According, the adoption of CLIA by teachers in during chemistry instruction at the senior school was recommended.