The student clearly states the independent variable as the concentration of green tea and the dependent variable as the rate of hydrogen peroxide decomposition, effectively connecting the variables in the research question. The method of analysis is well-defined, focusing on measuring the volume of oxygen gas produced. The student provides a thorough explanation of the techniques used, including the choice of a gas syringe for accurate measurements and adjustments made to the sampling technique based on preliminary trials. However, the student does not adequately discuss the rationale behind the selected concentrations of green tea or the number of trials conducted, which could have enhanced the investigation's credibility. Overall, the methodology is detailed and well-organized, enabling reproducibility and effectively addressing safety, ethical, and environmental concerns.
