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 158: 5.51c

Answer

In problem 4.48, we observed that r = -0.278, which implies a negative correlation. However, in parts (a) and (b), we observed that correlation is positive. This is due to the addition of a new variable of percentage (lurking variable).

Work Step by Step

In problem 4.48, we observed that r = -0.278, which implies a negative correlation. However, in parts (a) and (b), we observed that correlation is positive. This is due to the addition of a new variable of percentage (lurking variable).
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