Khetchonprathan, P., and P. Noumnom. “A Study on Statistical Knowledge and Statistical Thinking of Twelfth Grade Students in Schools under the Office of the Secondary Educational Service Area in Bangkok”. An Online Journal of Education, vol. 15, no. 1, June 2020, p. OJED1501007 (11 pages), https://so01.tci-thaijo.org/index.php/OJED/article/view/240250.