Rashidah Paujah @ Ismail, Nor, Fadzilah Abdol Razak, and Norhayati Baharun. 2018. “Investigating Students’ Difficulties in Understanding Confidence Intervals in Linear Regression Models”. International Journal of Engineering & Technology 7 (4.33): 60-64. https://doi.org/10.14419/ijet.v7i4.33.23485.