Final answer:
The question falls under the Mathematics subject, specifically dealing with High School level topics such as ratios, proportions, and percentages, often found in statistics and data analysis units.
Step-by-step explanation:
The subject of the question is Mathematics, specifically focusing on topics such as ratios, proportions, and percentage composition, as evidenced by the context of 4.4: Percentage Composition and 10.3: Comparing Two Independent Population Proportions. These topics commonly appear in a High School mathematics curriculum and involve problem-solving exercises that deal with understanding and applying mathematical concepts related to statistics, data analysis, and linear equations. For example, Problem 1 under Practice Test 1 Solutions discusses defining statistical terms such as population, sample, parameter, and statistic, which are fundamental to understanding how to handle mathematical data. Another aspect, mentioned under 4.4: Percentage Composition, describes how to calculate the percentage composition of a substance, which is crucial for solving chemistry-related mathematical problems.