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 120 phone numbers from the Caldwell phone book and calls each household. Only 62 of those called are willing to participate in the survey, and 56 participants would support a new downtown restaurant.
(a) The population of interest is
A. all households in the Caldwell phone book.
B. the 62 households that participated in the study.
C. the 120 phone numbers chosen.
D. all residents of Caldwell.
E. None of the above.
(b) The sample in this survey is
A. the 120 phone numbers chosen.
B. all residents of Caldwell.
C. all households in the Caldwell phone book.
D. the 62 households that participated in the study.
E. None of the above.
(c) The chance that all 120 phone numbers chosen are located in one particular neighborhood in Caldwell is
A. 120 divided by the size of the population of Caldwell.
B. exactly 0. Simple random sampling will spread out the locations of the phone numbers selected.
C. reasonably large due to the ''cluster'' effect.
D. the same as for any other set of 120 phone numbers.
E. None of the above.
D D D THIS IS THE CORRECT ANSWER
A,B,D
A B C
(a) The population of interest is D. all residents of Caldwell.
To determine if the residents of Caldwell, Idaho, would be interested in a new downtown restaurant, the marketing research firm wants to gather information from all residents of Caldwell, which is the population of interest.
(b) The sample in this survey is D. the 62 households that participated in the study.
The sample in this survey refers to the households that actually participated in the survey, which is 62 in this case.
(c) The chance that all 120 phone numbers chosen are located in one particular neighborhood in Caldwell is B. exactly 0. Simple random sampling will spread out the locations of the phone numbers selected.
Simple random sampling ensures that each phone number selected has an equal chance of being chosen and spreads out the selection across the entire population. Therefore, the chance of all 120 phone numbers being located in one particular neighborhood is exactly 0.