Answer
Both standard error and predicted mean velocity without observation 9 are significantly different than when the observation is included. This indicates that observation 9 is an influential observation.
Work Step by Step
Given above
The Basic Practice of Statistics 7th Edition
by Moore, David S.; Notz, William I.; Fligner, Michael A.
Published by
W. H. Freeman
ISBN 10:
146414253X
ISBN 13:
978-1-46414-253-6
Chapter 26 - Inference for Regression - Chapter 26 Exercises - Page 638: 26.28c
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