From the abstracyt: "This study aims to measure the ability to analyze descriptive data and analyze the statistical analysis results of responses from new students of the Faculty of Mathematics and Natural Sciences, Universitas Syiah Kuala. The test instrument consisted of 29 questions divided into three parts: understanding, application, and analysis."

From Wikipedia:

"In the Rasch model, the probability of a specified response (e.g. right/wrong answer) is modeled as a function of person and item parameters."

" By requiring measures to remain the same (invariant) across different tests measuring the same thing, Rasch models make it possible to test the hypothesis that the particular challenges posed in a curriculum and on a test coherently represent the infinite population of all possible challenges in that domain."

https://en.wikipedia.org/wiki/Rasch_model