Data Mining for Statistical Evaluation of Summative and Competency-Based Assessments in Mathematics. - Snezhana Georgieva Gocheva-Ilieva; Marta Teofilova; Anton I. Iliev; Hristina N. Kulina; Desislava Stoyanova Voynikova; Atanas Valev Ivanov; Pavlina Kh. Atanasova (CISIS-ICEUTE, 2019)