Answer
The regression line of the population is: $y=\beta_0+\beta_1x$ and the regression line of the sample is: $\hat{y}=b_0+b_1x.$
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: 4
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