Absolute_Value_Study 2025

01 – Institutional Research Authorisation (PDF)
Official document issued by the Directorate of the Polytechnic Institute of Cabinda, formally granting permission to conduct the research as part of the Master's programme in Mathematics Education. It confirms institutional support for data collection and implementation of the pedagogical intervention.

02 – Original Appendices in Portuguese (PDF)
Complete set of research instruments in Portuguese, including:

Classroom observation sheet
Teacher questionnaire (Polytechnic and PUNIV)
Student questionnaire (10th and 11th grade)
Interview guide for teachers
Pre-test and post-test applied to students
Teacher evaluation form regarding the intervention

03 – Translated Appendices in English (PDF)
Faithful English translation of the original Portuguese appendices. Ensures accessibility for international readers and preserves the structure and content of the original instruments.

04 – Complete Lesson Plan (PDF)
Detailed documentation of the pedagogical intervention, structured according to Galperin’s developmental stages and enriched with CLO and UDL principles. Includes practical activities using GeoGebra and Desmos, differentiation strategies, formative assessment tools, and teacher reflection prompts.

05 – Student Satisfaction Questionnaire (PDF)
Instrument used to assess students’ satisfaction with the Galperin-based methodology. Contains 10 closed items rated on a 1–10 scale, covering various instructional dimensions, and 3 open-ended questions for qualitative feedback.

06 – SPSS Raw Dataset (.sav)
Raw data file used for statistical analysis. Includes:

Pre- and post-test results
Conceptual error indicators
Student level, gender, and individual scores
Satisfaction ratings
Enables replication and further exploration of the study’s quantitative findings.

07 – SPSS Output Report (PDF)
Statistical output generated from the SPSS dataset. Presents:

Frequency tables of common errors
Crosstab analyses by grade level
Chi-square and t-test results
Evidence of the intervention’s impact on student performance