
Concept explainers
a
To draw
a

Explanation of Solution
Given information:
Graph:
Interpretation:
Using a graphic utility, the scatter plot for the given data is shown above.
b
To find if the scatter plot could be modeled by linear model, quadratic model or neither.
b

Answer to Problem 11E
Linear model
Explanation of Solution
Given information:
To determine if the given graph can be modeled by linear model, quadratic model or neither of them, try to draw a straight line or a parabola through the given scatter plot.
If a straight line can be drawn through the points of the scatter plot, it could be modelled by linear model whereas if a parabola can be drawn through the points of the scatter plot, it could be modelled by a quadratic model.
In case if both are not possible, it could neither be modeled.
Here, in the given graph we could draw a straight line. Therefore, the scatter plot could be modeled by a linear model.
Conclusion:
Therefore, given scatter plot is modeled by linear model.
c
To find a model for the data using regression feature of a graphing utility.
c

Answer to Problem 11E
Linear model
Explanation of Solution
Given information:
Calculation:
Using the graphic utility to find the regression,
Conclusion:
Therefore, from the above figure. the regression equation for the linear model is
d
To draw the model with the scatter plot from subpart (a) using a graphic utility.
d

Explanation of Solution
Given information:
Graph:
Interpretation:
Using a graphic utility, a straight line is formed when the data is kept on a graph.
e
To draw a table comparing the original data with the data given by the model.
e

Explanation of Solution
Given information:
Table:
Draw the table comparing the original data and the data given by the model.
Original data | Data from the model | ||
x | y | ||
0 | 2795 | 0 | 302.244 |
5 | 1590 | 5 | 441.458 |
10 | 650 | 10 | 580.671 |
15 | -30 | 15 | 719.885 |
20 | -450 | 20 | 859.098 |
25 | -615 | 25 | 998.312 |
30 | -520 | 30 | 1137.53 |
35 | -55 | 35 | 1276.74 |
40 | 625 | 40 | 1415.95 |
45 | 1630 | 45 | 1555.17 |
50 | 2845 | 50 | 1694.38 |
55 | 4350 | 55 | 302.244 |
Data from the model is obtained by substituting the values of x as
Interpretation:
When the original data and the data from the model are compared with each other, it is found that the values are nearly equal.
Chapter 2 Solutions
Precalculus with Limits: A Graphing Approach
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