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.

Step 1: What is the population?

All physicians practicing in the United States.

Physicians receiving the survey by mail.

All physicians who completed the survey.

Physicians receiving the survey by email.

Step 2: The sample size is ______.

Step 3: What is the rate of nonrepsonse? Round your answer to two decimal places. Do not include a percent sign in your answer.