Concept explainers
(a)
To write:The slope intercept form of the equation of regression line for the data given in table.
(a)
Answer to Problem 20PT
The equation of the regression line is
Explanation of Solution
Given:
The table is:
Calculation:
The equation for the regression line can be calculated by performing the following calculations.
Sum of X = 10
Sum of Y = 25632
Mean X = 2
Mean Y = 5126.4
Sum of squares (SSX) = 10
Sum of products (SP) = 6264
Regression Equation =
Here,
Substitute the values of a andb .
The equation of the regression line is
The plot for the regression line is:
(b)
To predict:The number of children in Russia who will be adopted in the year 2025.
(b)
Answer to Problem 20PT
In year 2025,
Explanation of Solution
Given:
The table is:
Calculation:
The equation for the regression line can be calculated by performing the following calculations.
Sum of X = 10
Sum of Y = 25632
Mean X = 2
Mean Y = 5126.4
Sum of squares (SSX) = 10
Sum of products (SP) = 6264
Regression Equation =
Here,
Substitute the values of a andb .
The equation of the regression line is
In the equation above, substitute 25 for X .
Therefore, a total of
Chapter 4 Solutions
Algebra 1
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