Concept explainers
a.
To verify defence department outlays.
a.
Answer to Problem 58E
Explanation of Solution
Given information:
The table shows the total national outlays
Find the least squares regression line
Calculation:
Consider the given system of equations,
Multiply equation
Substitute
Hence the result is
Now the least square regression formula is
b.
To verify defence department outlays.
b.
Answer to Problem 58E
The results are same as part
Explanation of Solution
Given information:
The table shows the total national outlays
Use the regression feature of a graphing utility to confirm the result of part
Calculation:
Now the least square regression formula is
Now use calculator to verify the part
Hence, the results are same as part
c.
To verify defence department outlays.
c.
Answer to Problem 58E
Explanation of Solution
Given information:
The table shows the total national outlays
Use the linear model to create a table of estimated values of Compare the estimated values with the actual data.
Calculation:
d.
To verify defence department outlays.
d.
Answer to Problem 58E
Explanation of Solution
Given information:
The table shows the total national outlays
Use the linear model to estimate the total national outlay for
Calculation:
Let
Put
Hence the total national outlay in
e.
To verify defence department outlays.
e.
Answer to Problem 58E
(Calculated value)
Explanation of Solution
Given information:
The table shows the total national outlays
Use the Internet, your school’s library, or some other reference source to find the total national outlay for
Calculation:
In
But the calculates value is
Hence, (calculated value)
f.
To verify defence department outlays.
f.
Answer to Problem 58E
This model is not valid for long-term predictions of total national outlays.
Explanation of Solution
Given information:
The table shows the total national outlays
Is the linear model valid for long-term predictions of total national outlays? Explain.
Calculation:
This model is not valid for long-term predictions of total national outlays.
Chapter 7 Solutions
EBK PRECALCULUS W/LIMITS
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