
Concept explainers
(a)
To find a
(a)

Answer to Problem 11PPS
Explanation of Solution
Given:
The given data is
Calculation:
Using the graphing calculator, after plotting the given data in the table, the regression equation and
The regression equation is
The coefficient of correlation is the value of the variable r.
(b)
To use the regression equation to predict the sales in 2015.
(b)

Answer to Problem 11PPS
Explanation of Solution
Given:
The given data is
Calculation:
Just substitute the value of
(c)
To remove the outlier from the data set and find a new regression equation and
(c)

Answer to Problem 11PPS
Explanation of Solution
Given:
The given data is
Calculation:
The regression equation is
The coefficient of correlation is the value of the variable r.
(d)
To predict the sales in 2015 using new regression equation.
(d)

Answer to Problem 11PPS
Explanation of Solution
Given:
The given data is
Calculation:
Just substitute the value of
(e)
To compare the correlation coefficients for the two regression equations and tell which is more accurate.
(e)

Answer to Problem 11PPS
The second prediction is more accurate.
Explanation of Solution
Given:
The given data is
Calculation:
The coefficient of correlation for the first regression equation is
Chapter 2 Solutions
Glencoe Algebra 2 Student Edition C2014
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