Answer
The slope of the regression line has the same sign as r (linear regression coefficient). Hence if r is positive, the regression line is increasing, but if r is negative, the regression line is decreasing.
Essentials of Statistics (5th Edition)
by Triola, Mario F.
Published by
Pearson
ISBN 10:
0-32192-459-2
ISBN 13:
978-0-32192-459-9
Chapter 10 - Correlation and Regression - 10-3 Regression - Page 513: 3
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