Linda is 31 years old, single, outspoken, and very bright. She majored in philosophy. As a student she was deeply concerned with issues of discrimination and social justice and also participated in anti-nuclear demonstrations.
Which of two alternatives is more probable:
A. Linda is a bank teller.
B. Linda is a bank teller and is active in the feminist movement.
The vast majority of U.S. college students who were given this question picked B, thus scoring an F for logical thinking.