4. An insurance company conducted a study to determine the percentage of cardiologist who had been sued for malpractice in the past 10 years. The sample was randomly selected from a national directory...

Extracted text: 4. An insurance company conducted a study to determine the percentage of cardiologist who had been sued for malpractice in the past 10 years. The sample was randomly selected from a national directory of doctors. What is the sample for this study? Select one of the following: a) the number of doctors who are cardiologists b) all cardiologists in the directory c) each cardiologist selected randomly from the directory d) the responses to the question, “Have you been sued for malpractice in the past 10 years?"