The Effect of Instructional Videos On Students’ Learning Outcomes In Cell Biology In Grade XI at SMA Negeri 6 Pematangsiantar

This study aimed to determine the effect of instructional videos on students’ learning outcomes in cell biology, particularly animal and plant cells, among Grade XI students at SMA Negeri 6 Pematangsiantar. The study employed a quantitative experimental approach using a pre-test and post-test control-group design. The sample consisted of 71 students: 35 students in class XI M3 as the experimental group, which learned with instructional videos, and 36 students in class XI M4 as the control group, which learned without instructional videos. Data were collected through learning-outcome tests and analyzed using the Mann–Whitney U test because the normality results indicated that the data were not normally distributed. The thesis reports that the experimental group’s mean score increased from 26.57% on the pre-test to 79.00% on the post-test. The control group increased from 25.42% to 49.47% in the results section. The Mann–Whitney test produced U = 118.500, Z = −6.017, and an asymptotic two-tailed significance value reported as 0.000 (p < 0.001). These findings indicate a statistically significant difference in learning outcomes between the two groups and support the use of instructional videos in teaching cell biology. The control-group post-test percentage requires confirmation because the thesis conclusion gives a different figure (48.47%).