A Teacher Asks His Students to Rate the Difficulty of Tests

Multiple Choice

A teacher asks his students to rate the difficulty of tests in his class from 1 to 10, and overall satisfaction with the class from 1 to 10. He thinks that students finding the tests less difficult will tend to be more satisfied with their experience in the class. What would be the ideal measure of association to test this idea?

A) Spearman's rho
B) Somers' d
C) phi
D) lambda