For a survey of senior citizens, a copy of the annual city census is obtained, and 30,000 residents sixty-five years of age and older are identified. A total of 400 seniors is selected, of whom 250 are interviewed. There are __________ senior citizens in the sampling frame.
A) 30,000
B) 400
C) 250
D) an unknown number of

Question

Quizplus · Accepted Answer

The sampling frame is the list of individuals from which the sample is drawn, which in this case is the 30,000 senior citizens identified from the city census.

For a Survey of Senior Citizens, a Copy of the Annual