Concept explainers
(a)
To find: The slope of the line
(a)
Answer to Problem 38E
The slope is b = 0.882
Explanation of Solution
Given:
Predicted reading score =
Calculation:
On comparing our equation to general equation of regression we get, the slope is: b = 0.882
This tells us that the reading score is predicted to go up by
Conclusion:
Hence, the slope is:
(b)
To find: The intercept and explain why the intercept value is not statistically meaningful.
(b)
Answer to Problem 38E
The intercept is: a = -33.4
The value of the Y intercept is meaningful only when the explanatory variable can actually take values close to zero.
Explanation of Solution
Calculation:
On comparing our equation to general equation of regression we get, the intercept is: a = -33.4
The value of the Y intercept is meaningful only when the explanatory variable can actually take values close to zero.
Conclusion:
Hence, the intercept is: a = -33.4
(c)
To predict: reading scores for two children.
(c)
Answer to Problem 38E
The reading score is 81.26 with IQ score 130 and it is 45.98 with IQ score 90
Explanation of Solution
Calculation:
The regression line is:
(Predicted) reading score
When IQ score = 90 then
(Predicted) reading score
Reading score will be 45.98 with IQ score 90.
When IQ score = 130 then
(Predicted) reading score
Conclusion:
Hence, the reading score is 81.26 with IQ score 130 and it is 45.98 with IQ score 90
Chapter 3 Solutions
The Practice of Statistics for AP - 4th Edition
Additional Math Textbook Solutions
Essentials of Statistics, Books a la Carte Edition (5th Edition)
Statistics: The Art and Science of Learning from Data (4th Edition)
Basic Business Statistics, Student Value Edition (13th Edition)
Statistics for Business and Economics (13th Edition)
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