The student clearly states the independent and dependent variables in the research question, identifying the steeping temperature of green tea leaves as the independent variable and the flavonoid concentration as the dependent variable. The methodology is well-articulated, detailing the method of analysis, including the use of spectrophotometric analysis at 510 nm, and providing a thorough background theory relevant to the research question. The choice of techniques for measuring the variables is clearly explained, and the student effectively addresses controlled variables, safety, ethical, and environmental issues associated with the investigation. However, there is a lack of discussion regarding the rationale behind the number of trials conducted, which could enhance the understanding of the methodology's reliability. Overall, the student provides a comprehensive and reproducible methodology, free of irrelevant information.
