Concept explainers
a.
To describe:the survey’s population and sampling method
a.

Answer to Problem 1C
The residents of the apartment are the population and the sampling method is stratified sampling.
Explanation of Solution
Given information:
“The manager of an apartment building wants to know if noise is a problem in the building. The manager asks one person on each floor if the person thinks noise is a problem.”
The population consist of all the person who are living in the apartment because the manager uses the rule “interview one person from each floor of the apartment”, so, the sampling method is a stratified sample where the population is divided according to their floor and one person is selected from each floor.
b.
To describe:the survey’s population and sampling method
b.

Answer to Problem 1C
This method could not result in a biased sample.
Explanation of Solution
Given information:
“The manager of an apartment building wants to know if noise is a problem in the building. The manager asks one person on each floor if the person thinks noise is a problem.”
This method could not result in a biased sample because each person from each floor could fairly represent the whole population.
c.
To describe:the survey’s population and sampling method
c.

Answer to Problem 1C
Another method of sampling is random sampling and it result in biased sample.
Explanation of Solution
Given information:
“The manager of an apartment building wants to know if noise is a problem in the building. The manager asks one person on each floor if the person thinks noise is a problem.”
Another method of sampling is that the manager can arrange a survey in which he randomly interview 20 persons who passes the entry gate of the apartment. So, the sampling method is random sampling and this method could result in a biased sample as it is not a representative of the population.
b
To explain: the survey could result in biased sample or not
b

Answer to Problem 1C
It will not be a biased sample as it is representative.
Explanation of Solution
Given information:
c
To describe: sampling method the manager could use and this method results in a biased sample or not
c

Answer to Problem 1C
Another method can be systematic sample.it may result in a biased sample as all the floor may not be representatied
Explanation of Solution
Given information:
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