The legal profession conducted a study to determine the percentage of cardiologists who had been sued for malpractice in the last five years. The sample was randomly chosen from a national directory of doctors. Identify the individuals in the study.
A) each cardiologist selected from the directory
B) the responses: have been sued/have not been sued for malpractice in the last five years
C) the doctorʹs area of expertise (i.e., cardiology, pediatrics, etc.)
D) all cardiologists in the directory