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 10E
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.
Incase 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 10E
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 | ||
y | |||
-2 | 11.0 | -2 | 10.87727 |
-1 | 10.7 | -1 | 10.68364 |
0 | 10.4 | 0 | 10.49 |
1 | 10.3 | 1 | 10.29636 |
2 | 10.1 | 2 | 10.10273 |
3 | 9.9 | 3 | 9.909092 |
4 | 9.6 | 4 | 9.715456 |
5 | 9.4 | 5 | 9.52182 |
6 | 9.4 | 6 | 9.328184 |
7 | 9.2 | 7 | 9.134548 |
8 | 9.0 | 8 | 8.940912 |
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 W/LIMITS:GRAPH.APPROACH(HS)
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