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Concept explainers
a.
To identify: The sample and the population.
a.
![Check Mark](/static/check-mark.png)
Answer to Problem 18PPS
Sample: People who take part in the survey.
Population: All people who vote.
Explanation of Solution
Given:
To estimate who the leading candidate is, the candidate’s committee surveys a large group of people selected at random. The returns indicate that their candidate is leading
Sample: People who take part in the survey.
Population: All people who vote.
b.
To state: Method of data collection.
b.
![Check Mark](/static/check-mark.png)
Answer to Problem 18PPS
The method of data collection is a survey.
Explanation of Solution
Given:
To estimate who the leading candidate is, the candidate’s committee surveys a large group of people selected at random. The returns indicate that their candidate is leading
Since data is collected through responses from a sample of the population, it is a survey. This data allows the committee to draw a conclusion about the leading candidate.
c.
To state: If sample is biased or unbiased.
c.
![Check Mark](/static/check-mark.png)
Answer to Problem 18PPS
The sample is biased.
Explanation of Solution
Given:
To estimate who the leading candidate is, the candidate’s committee surveys a large group of people selected at random. The returns indicate that their candidate is leading
Since data is collected from a large population, and not everyone is a voter, the sample is biased. The opinions of the non-voters will not matter and this will affect the result of the survey.
d.
To state: If sample is simple, stratified or systemic.
d.
![Check Mark](/static/check-mark.png)
Answer to Problem 18PPS
The sample cannot be classified.
Explanation of Solution
Given:
To estimate who the leading candidate is, the candidate’s committee surveys a large group of people selected at random. The returns indicate that their candidate is leading
Since the sample is biased, it cannot be classified as simple, stratified or systemic.
Chapter 12 Solutions
Algebra 1
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