Concept explainers
(a)
To calculate what is the equation of the least squares regression line.
(a)
Answer to Problem 35E
The regression line is:
Explanation of Solution
As we know that the least square regression line is as:
With
The constant
The slope
Then the least square equation then becomes:
With
(b)
To interpret the slope of least square regression line.
(b)
Answer to Problem 35E
The mileage increases on average by about
Explanation of Solution
We get the result from part (a) that:
With
Then the slope is the coefficient of x :
This means that the mileage increases on average by about
(c)
To find and interpret the residual of the data point.
(c)
Answer to Problem 35E
The residual is
Explanation of Solution
We get the result from part (a) that:
With
The data point is given to be
Thus, the residual is the difference between the actual and predicted value then,
This means that the predicts overestimates the mileage by
Chapter 10 Solutions
PRACTICE OF STATISTICS F/AP EXAM
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