The student precisely described the methods selected for both primary and secondary data collection, detailing a systematic approach to investigating 11 sites along the Mueang Nam River. They justified the chosen methods by emphasizing the significance of measurements like width, depth, and velocity in relation to their hypotheses, including the use of a flowmeter for velocity measurement. The student selected suitable techniques to ensure quality data collection, utilizing systematic sampling methods and providing clear instructions for accurate measurements. Additionally, they stated the date, time, and location of the data collection, which occurred on February 27th and 28th in Chiang Rai, Thailand. Lastly, the student included all necessary figures, such as maps and graphs, to effectively illustrate and support their investigative methods.
