Final answer:
Marcus's study likely investigated the effectiveness of the READ 180 program on 3rd-grade student achievement, focusing on literacy and numeracy improvements measured by various indicators of student progress and perceptions of support and enjoyment in school.
Step-by-step explanation:
Marcus's study suggested that READ 180 has an impact on 3rd-grade student achievement. In this study, student achievement is likely referring to the students' proficiency in reading, writing, and math, and how the use of the READ 180 program might improve these skills. Education models, such as READ 180, are designed to enhance literacy and numeracy, and their success is commonly measured by assessing improvements in students' abilities to read, comprehend, and utilize information effectively. The broader conversation about educational impact examines the effectiveness of interventions like READ 180. By analyzing the learning outcomes, such as the percentage of students who can read successfully, educators can determine the efficacy of these programs. In this case, student achievement may be assessed through traditional metrics like letter grades, but can also include students' perceptions of support from their teachers, their enjoyment of school, and their preparedness for further education or employment.