The student precisely described the methods selected for both primary and secondary data collection, outlining the location of survey sites and employing a stratified sampling methodology for a comprehensive investigation along the Da Dung river. The justification for the chosen methods was well articulated, demonstrating a thoughtful approach to ensuring representative data and accuracy in measurements. The techniques selected for data collection, including systematic sampling and the application of statistical analysis using Spearman's Rank Correlation, were suitable for obtaining quality data for subsequent analysis. Additionally, the student clearly stated the date, time, and location of the data collection, and included all necessary figures, such as maps and illustrations, to effectively explain the methods of the investigation.
