Welcome to the topic of continuous quality improvement (CQI)! This video course, CQI: Tools — Statistics, is meant to explain how statistics can be analyzed and used for improving workplace processes. This video lesson, Using Confidence Limits, is the fourth of five. It explains that, when working with statistics, you will have to deal with uncertainty. To do so, you will need to determine useful metrics from your data, including confidence levels, Z scores, and t-distributions.