What value indicates the percentage of values within a category as compared to the whole?

In Conway's theory of autobiographical memory, the set of particular and unique memories that we accumulate through our lives are called:

A. lifetime periods B. the working self C. general memories D. event specific memories

Professor Williams wants to know if "real" college students

exhibit the same kinds of behaviors in class that subjects who were paid to act like college students do. She decides to have someone come in once a week to her classes to record the types of nonverbal behaviors that students engage in while listening to her lectures. This would be an example of which kind of study? A) A formal experiment B) Naturalistic observation C) Case study D) Survey research