The Conjunction Fallacy

Read the following paragraph:

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 she also participated in antinuclear demonstrations.

Now rank the following options in terms of the probability of their describing Linda. Give a ranking of 1 to the most likely option and a ranking of 8 to the least likely option:

_____ Linda is a teacher at an elementary school.

_____ Linda works in a bookstore and takes yoga classes.

_____ Linda is active in the feminist movement.

_____ Linda is a psychiatric social worker.

_____ Linda is a member of the League of Women Voters.

_____ Linda is a bank teller.

_____ Linda is an insurance salesperson.

_____ Linda is a bank teller and is active in the feminist movement