PRECALCULUS:GRAPHICAL,...-NASTA ED.
10th Edition
ISBN: 9780134672090
Author: Demana
Publisher: PEARSON
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Expert Solution & Answer
Chapter 7.3, Problem 87E
Solution
a.
To state: A linear regression equation for the population of garland if x is the number of years since 1980 and the below given table shows the population (in thousands) of two fast-growing suburbs.
| Year | Garland (thousand) | Irving (thousands) |
| 1980 | 139 | 110 |
| 1990 | 181 | 155 |
| 2000 | 216 | 192 |
| 2010 | 227 | 216 |
The resultant answer is
Given information:
The given table is:
| Year | Garland (thousand) | Irving (thousands) |
| 1980 | 139 | 110 |
| 1990 | 181 | 155 |
| 2000 | 216 | 192 |
| 2010 | 227 | 216 |
Explanation:
Consider the given table:
| Year | Garland (thousand) | Irving (thousands) |
| 1980 | 139 | 110 |
| 1990 | 181 | 155 |
| 2000 | 216 | 192 |
| 2010 | 227 | 216 |
Use a graphing calculator; enter the time (years) starting at
Use LinReg feature (with L1 and L2) to obtain the linear regression model for the population of Garland:
Therefore, the resultant regression equation is:
b.
To state: A linear regression equation for the population of Irving if x is the number of years since 1980 and the below given table shows the population (in thousands) of two fast-growing suburbs.
| Year | Garland (thousand) | Irving (thousands) |
| 1980 | 139 | 110 |
| 1990 | 181 | 155 |
| 2000 | 216 | 192 |
| 2010 | 227 | 216 |
The answer is
Given information:
The given table is:
| Year | Garland (thousand) | Irving (thousands) |
| 1980 | 139 | 110 |
| 1990 | 181 | 155 |
| 2000 | 216 | 192 |
| 2010 | 227 | 216 |
Explanation:
Continue from part (a), use LinReg feature (with L1 and L3) to obtain the linear regression model for the population of Irving.
Therefore, the resultant linear regression equation is:
c.
To graph: The models from part (a) and Part (b) and use these models to determine when the population of the two cities will be about the same.
Given information:
The models from part (a) and part (b) are
Graph:
Consider the models
Now enter
And use the intersect feature to find the point of intersection:
The x -coordinate of the point of intersection is about 55 which corresponds to the year
Therefore, the population of the two cities will be about the same in the year 2035.
Interpretation: Both the equations are linear equations and their intersection point is
Chapter 7 Solutions
PRECALCULUS:GRAPHICAL,...-NASTA ED.
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