The student clearly stated the independent variable as the brewing temperature of green tea and the dependent variable as the concentration of antioxidants, measured by the volume of DCPIP solution. However, the research question lacked a clear description of the analysis method, specifically, how the antioxidant concentration would be measured. The student provided a thorough theoretical background relevant to the research question and explained the sampling technique used, along with the controlled variables, which were well documented. Additionally, the student identified and addressed safety, ethical, and environmental issues associated with the investigation, while the methodology was sufficiently detailed and free from irrelevant information, allowing for reproducibility.
