The student clearly states the independent variable as the concentration of robusta coffee and the dependent variable as the rate of fermentation in Saccharomyces cerevisiae, measured by CO2 production. However, the research question lacks clarity regarding the method of analysis, as it does not specify the instrument used for measurement. The student provides a well-structured background theory relevant to the research question and offers a clear explanation of the techniques used for measuring the variables. While the methodology is sufficiently detailed for reproducibility, there are gaps in discussing the number of trials, controlled variables, and ethical and environmental considerations that need to be addressed. Overall, the student demonstrates a solid understanding of the experimental design, but additional details and justifications are required for certain aspects.
