The student clearly states the independent and dependent variables in the research question, however, the tap water should also be listed as a variable. The student describes the method of analysis conducted in the research question and includes a background theory section closely related to the research question. There is a clear explanation of the choice of techniques used for measuring the independent and dependent variables, and a clear explanation of the choice of the sampling technique applied. The student identifies and addresses safety, ethical, and environmental issues associated with the investigation. However, the methodology is described sufficiently, including detailed steps of the procedure, names of materials, etc., to allow for the investigation to be reproduced, but it is recommended to provide self-designed diagrams or models of the experimental setup.
