Answer
If $\rho$ is 0, then there isn't any linear correlation, hence the slope of $\beta_1$ (regression line) will be 0.
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 517: 33
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