Lecture video for “Data Sense: An Introduction to Statistics for the Behavioral Sciences” by Barton Poulson. This video covers Chapter 07: Estimation, Section 05: Calculating Confidence Intervals. It explains how the z-score formula can be adapted to provide the upper and lower limits of the confidence interval, using a z-score that is derived from the desired level of confidence. The book and complete set of videos may be purchased at http://kendallhunt.com/poulson/.