Concept explainers
(a)
To find: Linear regression of the graph
(a)

Answer to Problem 25E
Linear regression of model is
Explanation of Solution
Given data:
Table of advertisement v/s Sales.
Formula used:
Slope intercept form:
Calculation:
- Linear regression of the model:
Conclusion:
Linear regression of model is
(b)
To find: Linear model is a good fit or not.
(b)

Answer to Problem 25E
Yes it is a good fit.
Explanation of Solution
Given data:
Table of advertisement v/s Sales.
Formula used:
Slope intercept form:
Calculation:
Yes this is a good fit because line of fit is have value nearly to original values.
Conclusion:
Yes it is a good fit.
(c)
To find: The slope of the graph.
(c)

Answer to Problem 25E
The slope of graph is 47.5
Explanation of Solution
Given data:
Table of advertisement v/s Sales.
Formula used:
Slope intercept form:
Calculation:
As the slope of the graph is positive so it is an increasing graph and In 2nd and 8th month there was same amount of advertisement with different sales and similarly in 3rd and 7th month also.
Conclusion:
The slope of graph is 47.5
(d)
To find: Sales for advertisement expenditure for $1500.
(d)

Answer to Problem 25E
Sales for advertisement expenditure for $1500 will be 29.4 thousand $
Explanation of Solution
Given data:
Table of advertisement v/s Sales.
Formula used:
Slope intercept form:
Calculation:
Sales for advertisement expenditure for $1500 will be:
Conclusion:
Sales for advertisement expenditure for $1500 will be 29.4 thousand $
Chapter 1 Solutions
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