The student clearly stated the independent variable as water temperature and the dependent variable as the mass of caffeine extracted from black tea leaves in the research question. The methodology was well-defined, detailing the method of analysis, including the rationale for techniques used and controlled variables. The student addressed safety, ethical, and environmental considerations appropriately, ensuring the investigation was conducted responsibly. Additionally, the methodology was described in a clear and organized manner, facilitating reproducibility without including irrelevant or repetitive information. Overall, the student's approach demonstrated a thorough understanding of the investigation's requirements.
