The Basic Practice of Statistics 7th Edition

Published by W. H. Freeman
ISBN 10: 146414253X
ISBN 13: 978-1-46414-253-6

Chapter 5 - Regression - Chapter 5 Exercises - Page 155: 5.35a

Answer

$b = r\frac{s_{y}}{s_{x}} = 0.5 \frac{8}{40} = 0.1$ $a = \bar y - b \bar x = 75 - 0.1 \times 280 = 47$ $\hat y = 47 + 0.1x$ This implies that for each point increase in score of pre-exam, score of final exam will increase by 0.1 on average.

Work Step by Step

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