I just used this example in class, and I realized that I never shared it on my blog. I really love this example of Type II error (and some other stuff, too). So here it goes. http://www.achievement.org/autodoc/page/mar1int-1
Updated approximately once a week. For more ideas that aren't awful, follow me on Twitter (@notawful) and Bluesky (@notawfuljess.bsky.social)