Concept explainers
a.
To find: Equation of line of best fit using graphing calculator and to identify and interpret
a.
Answer to Problem 27E
The equation of line of best fit is
Model is a good fit for the data.
There is a strong
Explanation of Solution
Given Information: Table with data values of hours spent watching television and grade point average.
Calculation:
Inputting the given data in a graphing calculator, results are,
As
Rounding (if needed) and substituting the values,
Thus, the equation of line of best fit is
Interpretation:
In the graphing calculator coefficient
b.
To interpret: The slope and
b.
Answer to Problem 27E
The slope
If television is not watched, grade point average would be
Explanation of Solution
Given Information: Table with data values of hours spent watching television and grade point average, graphing calculator results from the previous part.
Calculation:
Interpretation:
As can be seen in graphing calculator screen, slope
Putting
In this case, if television is not watched, grade point average would be
c.
To approximate: Grade point average of student who watches television for given number of hours.
c.
Answer to Problem 27E
The grade point average would be
Explanation of Solution
Given Information: Given number of hours is
Calculation:
Equation is
Putting
Thus, the grade point average would be
d.
If there is a causal relationship in given situation.
d.
Answer to Problem 27E
Yes, there is a causal relationship.
Explanation of Solution
Given Information: Situation is about number of hours spent watching television and grade point average.
Calculation:
Yes, there is a causal relationship. If student spends more time watching television he/she would get less time for studying and he/she would remain consumed in the contents of television.
Chapter 4 Solutions
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