The student clearly stated the independent and dependent variables in the research question, identifying the type of cooking oil and heating temperatures as the independent variables, with acid value and free fatty acid content as the dependent variables. The methodology was well described, including the method of analysis through acid-base titration, and the choice of techniques was justified based on the oils' fatty acid compositions. The student effectively discussed the sampling technique, controlled variables, and safety, as well as ethical, and environmental considerations related to the investigation. The detailed methodology ensured reproducibility, with no irrelevant or repetitive information included, allowing for a clear understanding of the experimental process.
