At the Start of Class, Professor Stevens Tells Students That

Multiple Choice

At the start of class, Professor Stevens tells students that she wants to measure how many pages of notes they take during class. At the end of the class, Professor Stevens finds that the students have taken a remarkable amount of notes-clearly more than they usually would have. Which of the following is of concern for Professor Stevens?

A) The observational effect
B) The Thomas theorem
C) Murphy's law
D) The Hawthorne effect