The student clearly states the independent and dependent variables in the research question, specifying the unit for hypertensive heart disease (HHD) as deaths per 100,000 people. Additionally, the document includes a background theory section that contextualizes the research question and describes concepts directly relevant to it. The choice of techniques used for measuring the independent and dependent variables is explained, and the methodology is sufficiently described, including detailed steps of the procedure and names of materials, allowing for the investigation to be reproduced. Furthermore, the student identifies and addresses safety, ethical, and environmental issues associated with the investigation. Although there are some areas for improvement, such as providing a brief explanation for the choice of the death rate per 100,000 persons as a metric for the dependent variable and discussing the choice of the sampling technique applied, the student has demonstrated a solid understanding of the research requirements.
