The student clearly identified the independent variable as the change in sunscreen SPF levels and the dependent variable as the percentage change in the mass of pig's skin, providing a solid context for the investigation. However, the research question lacked a clear method of analysis for measuring water loss, which could have been improved by specifying the use of a precision balance. The background theory section was not cohesive with the study's context, missing connections between the pig's skin properties and their relevance to the experiment. While the student effectively explained the choice of techniques and discussed sampling and trial aspects, there were shortcomings in addressing controlled variables, ethical considerations, and environmental implications. Overall, the methodology was logical and free of irrelevant information, but it required more detail for reproducibility and a thorough exploration of ethical and environmental issues.
