
Concept explainers
(a)
To find: A quadratic model using a graphic utility.
(a)

Answer to Problem 67E
A quadratic model is
Explanation of Solution
Given:
The data set is:
Year | Revenue |
2007 | 7.67 |
2008 | 8.54 |
2009 | 8.73 |
2010 | 9.16 |
2011 | 11.65 |
2012 | 14.07 |
2013 | 16.05 |
Calculation:
Follow the provided steps of Ti-83 plus calculator to compute a quadraticas:
- Turn on the calculator.
- Click on STAT > Edit > Enter.
- Enter the data of x in L1 and data of y in L2.
- Click om STAT > CALC >QuadReg> ENTER.
- Hit 2nd and 1 to choose L1 and Hit 2nd and 2 to choose L2.
- Hit Enter.
The obtained output is:
From the above output, the quadratic model is
(b)
To construct: The model using the graphing utility. Also, estimate the slope of the graph if t is 12 and interpret the result.
(b)

Answer to Problem 67E
The slope is 13.6534.
Explanation of Solution
Graph:
Follow the provided steps of Ti-83 plus calculator to construct the figure:
- Turn on the calculator.
- Click on STAT > Edit > Enter.
- Hit Y= and enter the regression.
- Press 2nd key and Y and press twice and chose the mark of rectangle.
- Hit zoom button and 9th key.
The obtained output is:
Calculation:
From the above part, the quadratic model is:
Then the slope is approximately 13.6534.
It implies that the population is increasing by the rate of 1365.34 per year
(c)
To find: The derivative of the model computed in part (a) and evaluate it for t = 12
(c)

Answer to Problem 67E
The value is 2.392.
Explanation of Solution
Calculation:
The quadratic model is:
Now, take the derivative of above function with respect to t as:
Now, plug in t = 12 in above expression as:
Thus, the required value is 2.392.
(d)
To draw:The conclusion regarding the results the previous parts.
(d)

Explanation of Solution
Since, the quadratic model is:
And, its derivative is:
Because it is depending on the time. Thus, it could be said that it is a good model
Chapter 11 Solutions
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