The Basic Practice of Statistics 7th Edition

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

Chapter 24 - Inference about Variables: Part IV Review - Test Yourself - Page 564: 24.2

Answer

See below.

Work Step by Step

We need the samples to be random samples from the population, which is vital. Furhermore, the population distribution has to be approximately normal, but the sample size of $27$ is almost enough to use the Central Limit Theorem, thus this is not so vital.
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