Question

Each month, the census bureau mails survey forms to 250,000 households asking questions about the people living in the household and about such things as motor vehicles and housing costs. Telephone calls are made to households that don't return the form. In one month, responses were obtained from 240,000 of the households contacted.

The population of interest is

A. the residents in the suburb that support the new recreation center.
B. the 250,000 households contacted.
C. only U.S. households with phones.
D. all U.S. households.

A political party sends a mail survey to 1500 randomly selected registered voters in a community. The survey asks respondents to give an opinion about the job performance of the current President. Of the 1500 surveys sent out, 480 are returned, and of these, only 120 say they're satisfied with the President's job performance.

This is an example of

A. a survey with little bias since people understand whether they approve of the President's job performance.
B. a survey with little bias because 1500 voters represent an important part of his district.
C. a survey containing nonresponse.
D. All of the above