In a sample of 400 students in a university, 80, or 20%, are Business majors. Based on the above information, the school's paper reported that "20% of all the students at the university are Business majors." This report is an example of( ).
A、a sample;
B、a population;
C、statistical inference;
D、descriptive statistics
发布时间:2025-03-04 17:33:11