The student clearly stated the independent variable as temperature and the dependent variable as the relative absorbance of the natural fruit dye extracted from frozen blueberries. The research question included a description of the method of analysis, specifically using a spectrometer for quantitative measurements. The background theory was well-developed, discussing anthocyanins and their relevance to the investigation, while the choice of techniques and sampling methods was clearly explained. However, the student did not adequately address controlled variables, ethical issues, or environmental considerations associated with the investigation. Overall, the methodology was detailed and allowed for reproducibility, free of irrelevant information.
