우선 연구 주제를 수립하고 관련 문헌과 선행연구를 탐색하여 확률과 통계 교과서를 분석한 결과를 토대로 예비검사 도구를 개발, 적용하였다.
First, a research topic was established, related literature and prior research were searched, and a preliminary test tool was developed and applied based on the results of analysis of probability and statistics textbooks.