The student clearly states the independent variable as the temperature of orange juice and the dependent variable as its antioxidant capacity, measured through the DPPH assay. The research question includes a specific method of analysis, detailing how the effect of temperature on antioxidant capacity will be assessed. A comprehensive background theory section is provided, explaining relevant biochemical processes and the significance of the DPPH assay. The choice of techniques for measuring the variables is well justified, although the student does not adequately explain the sampling technique or the rationale behind the number of trials conducted. Overall, the methodology is detailed and well-structured, allowing for reproducibility, while addressing safety, ethical, and environmental considerations.
