It is impossible to tell whether the argument is logically valid. If there is a vowel on one side, then there is an even number on the other side. If someone is drinking, then they are over 21. In both problems, approximately the same percentage of subjects gave the correct answer. There are 4 cards on a table.
Every card has a clinical diagnosis on one side and a drawing of a face on the other.
There is a tennis tournament with 1000 people entered. If a person loses one match, she is eliminated. Sally is over 21. Therefore, Sally is legally allowed to drink alcohol. A man looks at a portrait.