Concept explainers
(a)
To make: a
(a)
Answer to Problem 67E
Explanation of Solution
Given:
Percent return | 74 | 66 | 81 | 52 | 73 | 62 | 52 | 45 | 62 | 46 | 60 | 46 | 38 |
New adults | 5 | 6 | 8 | 11 | 12 | 15 | 16 | 17 | 18 | 18 | 19 | 20 | 20 |
Calculation:
We put percent return (the explanatory variable) on the horizontal axis and new adults (the response variable) on the vertical axis.
The below figure is the scatter plot for the given data.
From the scatter plot. Point A and B are identified as outliers. Point A is the outlier in the X direction of the scatterplot.
Conclusion:
Thus, the required scatterplot is drawn.
(b)
To find: the point which is more influential for the regression line.
(b)
Answer to Problem 67E
Point A is more influential because the least-squares regression line deviates more strongly from the line with the original points where A is included.
Explanation of Solution
Calculation:
The below figure shows the results of removing each of these points on the
Conclusion:
Thus, point A is more influential.
Chapter 3 Solutions
The Practice of Statistics for AP - 4th Edition
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