List the characteristics a-f on the basis of the brief description of the survey
ID: 3055802 • Letter: L
Question
List the characteristics a-f on the basis of the brief description of the survey shown below.
The information that comes with a hybrid car includes a registration card to be returned to the manufacturer. Among questions that identify the purchaser, the registration card asks him or her to identify their gas station or gas company.
(a) Identify the population. Choose the correct answer below.
A. all people who own hybrid cars
B. all hybrid car hybrid cars
C. purchasers of that brand of hybrid car
D. all people
(b) Identify the parameter of interest. Choose the correct answer below.
A. percentage of people who own hybrid cars
B. percentage of people who purchased that brand of hybrid car
C. percentage of people in the area who were surveyed
D. percentage of people who use various gas stations or gas companies
(c) Identify the sampling frame. Choose the correct answer below.
A. all purchasers who received the registration card
B. all people
C. all purchasers who returned the completed registration card
D. This information is not given.
(d) Identify the sample size. Choose the correct answer below.
A. the number of hybrid cars sold
B. the number of people in the area who were surveyed
C. the number of people who did not respond to the survey
D. This information is not given.
(e) Identify the sampling design, including whether randomization was employed. Choose the correct answer below.
A. not specified, but at least "random"
B. not specified, non-random
C. stratified sampling, random
D. voluntary response, non-random
(f) Identify any potential sources of bias or other problems with the survey or sample. Choose the correct answer below.
A. Nonresponse bias is possible, since many people that receive registration cards with products never fill them out.
B. Convenience sampling bias is possible since it is easier to get information from people who buy hybrid cars than most other people.
C. Undercoverage bias is possible, since only people who purchased hybrid cars were surveyed instead of all people.
D. There is no indication of bias.
Explanation / Answer
(a) The population is all people who bought hybrid cars since they are the only ones eligible for registration.
The answer is :
A. all people who own hybrid cars.
(b) The parameter of interest is :
D. percentage of people who use various gas stations or gas companies
(c) The sampling frame is the list or collection of items that form the population from which the sample is taken.
The answer is :
C. all purchasers who returned the completed registration card.
(d) The sample size is not known.
The answer is :
D. This information is not given.
(e) Since the response is not mandatory, the sampling technique is:
D. voluntary response, non-random.
(f) Since response is voluntary,
A. Nonresponse bias is possible, since many people that receive registration cards with products never fill them out.
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