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: 18.37a

Answer

P value decreases

Work Step by Step

The sample size is increased and the sample contains more info. It is easier to reject the null hypothesis and thus the P-value has to be smaller.
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