Gordon is conducting a memory study that consists of two treatment conditions. All goes well on the first day when he is working
with the first treatment condition. However, on the second day, violent thunderstorms descend when he is working with the second treatment condition. What is the source of the threat to internal validity?
When your baby grunts, it usually means they're learning how to have a bowel movement. They haven't yet figured out how to relax the pelvic floor while also using abdominal pressure to move stool and gas through their system.
