The student clearly states the independent and dependent variables in the research question, including the method of analysis conducted. The document includes a relevant background theory section and provides a clear explanation of the choice of techniques used for measuring the variables. The student also discusses the choice of the sampling technique and the rationale behind the selection of the range of ethanol concentrations. Additionally, the student names controlled variables, addresses safety, ethical, and environmental issues associated with the investigation. However, the methodology description lacks sufficient detail and clarity, requiring improvement to allow for reproducibility. Overall, the student demonstrates a strong understanding of the experimental design and relevant considerations, with room for improvement in the methodology section.
