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For a survey of senior citizens, a copy of the annual city census is obtained, and 30,000 residents 65 years of age and older are identified.


For a survey of senior citizens, a copy of the annual city census is obtained, and 30,000 residents 65 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.unknown number

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