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Concept explainers
a.
To identify: The sample and the population.
a.
![Check Mark](/static/check-mark.png)
Answer to Problem 19PPS
Sample: Customers who take part in the survey.
Population: All customers of the company.
Explanation of Solution
Given:
A shoe company’s website keeps a count of styles and colors chosen by customers when ordering online.
Sample: Customers who take part in the survey.
Population: All customers of the company.
b.
To state: Method of data collection.
b.
![Check Mark](/static/check-mark.png)
Answer to Problem 19PPS
The method of data collection is a survey.
Explanation of Solution
Given:
A shoe company’s website keeps a count of styles and colors chosen by customers when ordering online.
Since data is collected through responses from a sample of the population, it is a survey. This data allows the company to draw a conclusion about the styles and colors chosen by customers.
c.
To state: If sample is biased or unbiased.
c.
![Check Mark](/static/check-mark.png)
Answer to Problem 19PPS
The sample is unbiased.
Explanation of Solution
Given:
A shoe company’s website keeps a count of styles and colors chosen by customers when ordering online.
Since data is collected from a random group of people, the survey is unbiased. Also, the survey does not favor one group over the other.
d.
To state: If sample is simple, stratified or systemic.
d.
![Check Mark](/static/check-mark.png)
Answer to Problem 19PPS
The sample is simple random sample.
Explanation of Solution
Given:
A shoe company’s website keeps a count of styles and colors chosen by customers when ordering online.
The survey is conducted using a random group of people. Another group of people or sample were equally likely to be chosen. Hence, the given survey uses a simple random sample.
Chapter 12 Solutions
Algebra 1
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