The student clearly states the independent and dependent variables in the research question, specifying the units in which the variables are measured. Additionally, the student outlines the method of analysis conducted, which will be the Winkler titration method. The document includes a well-structured background theory section, relevant to the research question, and explains the choice of techniques used for measuring the variables. The student also provides a clear explanation of the choice of the sampling technique applied and addresses safety, ethical, and environmental considerations associated with the investigation. The methodology is sufficiently described, including detailed steps of the procedure and materials, allowing for the investigation to be reproduced without including irrelevant or repetitive information.

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The student's description of how the data was obtained and processed lacks clarity, as they are advised to provide formulas and exemplary calculations for obtaining the average volume of the titer. However, the student's detailed and precise description of data recording and processing, including appropriate annotations and correct usage of units, decimal places, and significant figures, enhances the overall quality of the work. Additionally, the document includes clear considerations of the impact of uncertainties on the data and results, with computed uncertainties and standard deviation values provided. There are no major inaccuracies that would hinder the validity of the conclusion, and the student conducts relevant data processing that accurately addresses the research question, particularly in investigating the dissolved oxygen concentration in city ponds.

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This is an example of past student work. Do not copy or submit as your own. Use to understand the requirements, expectations, structure and flow.