The Basic Practice of Statistics 7th Edition

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

Chapter 2 - Describing Distributions with Numbers - Chapter 2 Exercises - Page 70: 2.43a

Answer

The negative values mean the patients gained weight.

Work Step by Step

If a patient started at 150 kilograms and ended at 160 kilograms, then they would have lost a negative 10 kilograms. Since people cannot lose negative weights, this means they gained weight.
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