Concept explainers
(a)
To find: The equation of the line of best fit and
(a)
Answer to Problem 27E
The equation of the line of best fit is
Explanation of Solution
Given:
Hours, x | Grade point average, y |
Calculation:
Consider the table shows the grade point average
To use the linear regression feature of the
Now press the
Now to calculate the linear regression, that is
In order to input the list to use while finding the linear regression, press
Therefore, the equation of the line of best fit is
To make the graph using graphing calculator, press the
The graph obtained is shown below
Conclusion:
The equation of the line of best fit is
(b)
To find: The slope and
(b)
Answer to Problem 27E
The slope and
Explanation of Solution
Given:
Hours, x | Grade point average, y |
Calculation:
The slope of the line is
The
No meaning in this context because the time cannot be zero
Conclusion:
There may be no causal relationship between year and the number of text messages
(c)
To find: The students grade point average
(c)
Answer to Problem 27E
The grade point average of the student is
Explanation of Solution
Given:
Hours, x | Grade point average, y |
Calculation:
Consider another student watches about
Put the value
The grade point average of the student is
Conclusion:
Therefore, the grade point average of the student is
(d)
To find: Whether there is a casual relationship
(d)
Answer to Problem 27E
There is no causal relationship as the time consumed to watch the television student does not determine the average grade
Explanation of Solution
Given:
Hours, x | Grade point average, y |
Calculation:
There is no causal relationship between time spent watching television and grade point average. As the time consumed to watch the television student does not determine the average grade that is GPA
Conclusion:
Therefore, there is no causal relationship between time spent watching television and grade point average.
Chapter 4 Solutions
BIG IDEAS MATH Integrated Math 1: Student Edition 2016
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