
Concept explainers
a.
To find: the logistic regression for the data.
a.

Answer to Problem 41RE
Explanation of Solution
Given information: Table shows the growth of the U.S. population from 1790 to 2000 in 30- year’s increments and indicates the growth in 2010.
Year | Growth |
1790 | 3929 |
1820 | 9638 |
1850 | 23,192 |
1880 | 50189 |
1910 | 92,228 |
1940 | 132,165 |
1970 | 203,302 |
2000 | 281,422 |
2010 | 309,447 |
Calculation:
The logistic regression curve, for population P, t years after 1820 as produced by graphing utility:
b.
To graph: the data in a
b.

Answer to Problem 41RE
Explanation of Solution
Given information:
Calculation: Let t = 0 for 1970 then the above table would be written as.
Year ( t) | Growth ( P) |
0 | 3929 |
30 | 9638 |
60 | 23,192 |
90 | 50189 |
120 | 92,228 |
150 | 132,165 |
180 | 203,302 |
210 | 281,422 |
220 | 309,447 |
Scatter plot of the table data shown below.
c.
To predict: the U.S. population in the 2050.
c.

Answer to Problem 41RE
Explanation of Solution
Given information:
Calculation:
2050 is 260 years after 1970, so t = 260 plug that into the regression equation to find the U.S. population in the 2050.
d.
To find: in what year was the U.S. population growing the fastest and what significant behavior does the graph of the regression equation exhibit at that point
d.

Answer to Problem 41RE
About year 2000.
Explanation of Solution
Given information:
Calculation:
Scatter plot of the table data shown below.
From the graph, the population is increasing the fastest around t =210 .or the year 2000.
The slope of the tangent line at that point is greatest there, in other words, the change in population over the change in time is largest.
The concavity also changes at that point, so it is a point of inflection.
e.
To find: what does the regression equation indicate about the population of Pennsylvania in the long run.
e.

Answer to Problem 41RE
In the long term, the equation says the population will stabilize at around
Explanation of Solution
Given information:
Calculation:
So, in the long term, the equation says the population will stabilize at around
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