Concept explainers
a
To draw
a
Explanation of Solution
Given information:
Let
The above table shows the number of commercial FM radio stations S in United States from 2004 through 2013.
Graph:
Interpretation:
Using the graphing utility, the scatter plot for the given data is shown above.
b
To graph the given cubic model using graphing utility.
b
Explanation of Solution
Given information:
Cubic model
Graph:
Interpretation:
Using the graphing utility, the scatter plot for the given data is shown above.
From the graph, it is observed that the cubic model best fits the data. Since the curve passes through all the points of the scatter plot in subpart (a).
Conclusion:
Cubic model best fits the data.
c
To find a quadratic model for the data using regression feature of a graphing utility and coefficient of determination.
c
Explanation of Solution
Given information:
Calculation:
Using the graphing utility to find the regression,
Insert the data in the table in a graphing utility to get the following results:
Conclusion:
Therefore, from the above figure, the regression equation for the quadratic model is
d
To draw the graph for quadratic model with the scatter plot from subpart (a) using a graphing utility and find if the quadratic model a good fit for the data.
d
Answer to Problem 159RE
Cubic model
Explanation of Solution
Given information:
Refer to the scatter plot in subpart (a).
Graph:
Interpretation:
Using a graphing utility, a parabola is formed when the data is kept on a graph.
Quadratic model is not a good fit because the curve of the parabola does not pass through all the points of the scatter plot.
e
To find the model that fits best for the data provided.
e
Answer to Problem 159RE
Cubic model
Explanation of Solution
Given information:
From graphs of the subparts (b) and (d),
On closely examining the graph of the subparts (b) and (d),
It is found that none of the points of the scatter plot passes through the quadratic model while all the points pass through the graph of the cubic model.
Conclusion:
Therefore, the graph of the subparts (b) and (d) shows the best fit for a set of data.
f
To predict the number of commercial FM radio stations in 2015 referring to the model chosen in part (e)
f
Explanation of Solution
Given information:
Refer to answer in part (e)
Consider the cubic model,
Substitute
Conclusion:
Therefore, the number of commercial FM radio stations in 2015 is 6510.75.
Chapter 2 Solutions
Precalculus with Limits: A Graphing Approach
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