a.
To interpret: The y-intercept in the context of provided study.
a.
Explanation of Solution
Given:
The figure is:
The regression line is given as:
Here, y-intercept is 3.42 which means that if no book is read by any of the students then the English grades are expected to be approx. 3.42.
b.
To find: The residual of the student.
b.
Answer to Problem 25E
The confidence interval is (0.11968, 0.44832)
Explanation of Solution
Given:
Number of books read = 17
GPA = 2.85
Calculation:
The estimated GPA could be calculated as:
Now the residual is computed as:
Thus, the required residual is -0.9831.
c.
To explain: The extent of the relationship between the two variables.
c.
Answer to Problem 25E
There is a weak relationship between the variables.
Explanation of Solution
The coefficient of determination shows the variation that is explained by the predictor variable on the response variable. Here, coefficient of determination is 0.083.
Since, the coefficient of determination is low. Thus, it could be said that there is a weak relationship between the variables.
Chapter 11 Solutions
The Practice of Statistics for AP - 4th Edition
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