A marketing research firm wishes to determine if the residents of Caldwell, Idaho, would be interested in a new downtown restaurant. The firm selects a simple random sample of 180 phone numbers from the Caldwell phone book and calls each household. Only 72 of those called are willing to participate in the survey, and 55 participants would support a new downtown restaurant.

(a) The sample in this survey is

A. the 180 phone numbers chosen.
B. the 72 households that participated in the study.
C. all households in the Caldwell phone book.
D. all residents of Caldwell.
E. None of the above.

(b) The population of interest is

A. all residents of Caldwell.
B. all households in the Caldwell phone book.
C. the 180 phone numbers chosen.
D. the 72 households that participated in the study.
E. None of the above.

(c) The chance that all 180 phone numbers chosen are located in one particular neighborhood in Caldwell is

A. exactly 0. Simple random sampling will spread out the locations of the phone numbers selected.
B. 180 divided by the size of the population of Caldwell.
C. reasonably large due to the ''cluster'' effect.
D. the same as for any other set of 180 phone numbers.
E. None of the above.