Ingrid and a friend of Ingrid's sometimes notice that they often feel terrific the day after their menstrual periods end. They've discussed this with each other a few times. What is the most likely explanation for their observations?

Question

Quizplus · Accepted Answer

This phenomenon is an example of confirmation bias, where Ingrid and her friend are only noticing instances that confirm their belief that they feel better after their periods end. They may not be noticing instances where they feel the same or worse after their periods end, leading them to believe that it consistently makes them feel better. This is not the same as postmenstrual or premenstrual syndrome.

Ingrid and a Friend of Ingrid's Sometimes Notice That They