Source: Section 9.3 in Statistics I at Elgin Community Collage
How to access: This is free to access. Lecture notes and video are available. The length of video lecture for this section is about 5 min.
Example(s) used in this: IQ data
Prior math/stat knowledge to fully understand matrials: This is one of the sections in a course. To understand this section, knowledge about the concept of confidence interval, how to construct a confidence interval. For those who are not familiar with these, sections prior to Section 9.3 would help.