eng Science and Education Publishing Applied Ecology and Environmental Sciences 2328-3920 2021-11-01 9 11 914 918 10.12691/aees-9-11-1 AEES20219111 article Sudevi Basu sudevi_biotech@sirmvit.edu 1 K S Lokesh 2 Department of Biotechnology, Sir M Visvesvaraya Institute of Technology, Bengaluru-562157, Karnataka, India Retired, India Two sampling stations N1 and N4a are selected on the River Kabini stretch at Nanjangud, Karnataka, India. In this research, the assessment of the 20 year-data (2000 每 2019) indicate Water Quality Index of 75.3 and 95.3 at stations N1 and N4a respectively, which categorizes the water quality of the River Kabini at this stretch as ※very poor§. This assessment is useful to policymakers in deciding future course of action to protect the river from anthropogenic deterioration. Also, statistical analysis in the form of t-test for the 17 每 year, 3 每 year and 20 每 year period indicates the ＆p＊ value (p = 0.29, 0.21 and 0.22) respectively, which is greater than the significant value 0.05. Similarly, the critical value during the 17 每 year, 3 每 year and 20 每 year period is 2.06, 4.30 and 2.04 respectively and is also greater than measured t statistics values of -1.08, -1.79 and -1.26 respectively. This reveals that the difference in WQI of N1 and N4a monitoring stations is insignificant. http://pubs.sciepub.com/aees/9/11/1/aees-9-11-1.pdf water quality index t-test t statistics