Professor Greenberg Conducts a Field Experiment in Which a Research

Multiple Choice

Professor Greenberg conducts a field experiment in which a research assistant pretends to fall, hurt his knee, and be unable to stand up. In a randomly determined order, the research assistant either calls out for help or remains silent. The dependent variable is the amount of time that elapses between the "accident" and a passer-by stopping to help. Professor Greenberg is using the ________ strategy to implement his independent variable.

A) accosting
B) unobtrusive
C) street theater
D) field intervention