The Basic Practice of Statistics 7th Edition

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

Chapter 22 - Inference about a Population Proportion - Apply Your Knowledge - Page 528: 22.11b

Answer

Large enough.

Work Step by Step

If $np_0\gt 15$ and $n(1-p_0)\gt15$, then the sample is large enough. Here $np_0=900\cdot0.5=450\gt 15$ and $n(1-p_0)=900\cdot0.5=450\gt 15$, thus the sample is large enough.
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