Do breathing exercises affect anxiety?

This activity can be used to help students understand research methods, descriptive statistics and inference. Data is collected on each person's perceived level of anxiety before and after a deep breathing exercise. The students are invited to compare that data informally, before considering possible statistical testing and then applying the Wilcoxon signed-rank test to the data. Thanks to @DeborahSekreta for the breathing slide.

By Catherine van Saarloos