National Health Interview Survey Is Conducted Annually by the Centers

Multiple Choice

National Health Interview Survey is conducted annually by the Centers for Disease Control and Prevention.By examining information gathered from a national sample of 600 respondents throughout the U.S.,it was able to announce that 14.1 percent of all Americans lacked healthcare insurance.To make this statement,the Centers for Disease Control and Prevention had to use

A) focus groups.
B) no constraints.
C) internal secondary data.
D) statistical inference.
E) interpolation.