The student has clearly described and explained the research design, including the use of a repeated measures design. The sampling technique, which was opportunity sampling, is described and the rationale for choosing this method is provided. The student has provided a comprehensive description of the participants, including their gender, age, grade, attended school, English proficiency, socio-economic status, ethnicity, and mathematical abilities. Additionally, the student has explained the reasons for controlling variables and the choice of materials used.
