Lecture video for “Data Sense: An Introduction to Statistics for the Behavioral Sciences” by Barton Poulson. This video covers Chapter 08: Hypothesis Testing, Section 08: Accuracy and Error. It explains the connections between samples and their corresponding populations and how the resulting decision can be accurate or can lead to false positives, known as “Type I errors” or false negatives, or “Type II errors.” The book and complete set of videos may be purchased at http://kendallhunt.com/poulson/.