In 2010, the Physicians Foundation conducted a survey of physicians’ attitude about health care reform, calling the report “a survey of 100,000 physicians.” The survey was sent to 100,000 randomly selected physicians practicing in the United States: 40,000 via post‑office mail and 60,000 via email. A total of 2,379 completed surveys were received. (a). What is the population sampled in this survey?
1. All Physicians practicing in the United States
2. All Physicians receiving the survey by mail.
3. All Physicians who completed the survey.
4. All Physicians receiving the survey by email.

What is the sample size?
sample size (n) =

(b). What is the rate of nonresponse? (enter your answer as percent rounded to two decimal places.)

rate of nonresponse =

(c). Why is it misleading to call the report “a survey of 100,000 physicians”?

1. It is misleading because only 2379 responses were received.
2. It is misleading because the respondents may not all have been physicians.
3. It is misleading because responses via email do not count toward survey results.
4. It is misleading because there was a low rate of nonresponse for this survey.
5. It is misleading because some were contacted by post‑office mail and some by email. They should have all been contacted using the same method.