The Basic Practice of Statistics 7th Edition

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

Chapter 18 - Inference in Practice - Chapter 18 Exercises - Page 436: 18.40a

Answer

See below.

Work Step by Step

A significant difference implies that the difference is so big that it is very unlikely that it is only due to chance. $P\lt0.01$ implies that we have a less than $0.01$ chance of getting such or more extreme of a difference in a random sample from the population.
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