ABSTRACT The research discusses the topic of math teachers teaching in senior high school lecture and “interpret between confidence interval and confidence level”. They face some questions and the situation of student’s adaptation. In addition, the design of the lessons with the compilation of the textbooks is tend to ignore the student’s recommendation or not. The research adopts qualitative analysis and interviews from some teachers who teach in public and private high schools. Analyzing and assorting the data of the research. According to the results, researchers not only can understand the problems that math teachers teach in senior high, but also the researchers can use it as a reference. In the future, people look forward that the research will be useful and beneficial for our country with the compilation of the frameworks of math textbooks. Keywords: confidence interval, confidence level