The Basic Practice of Statistics 7th Edition

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

Chapter 21 - Comparing Two Means - Apply Your Knowledge - Page 486: 21.4

Answer

(3) two independent samples.

Work Step by Step

We have $2$ samples (new battery and prototype) but the subjects of the two samples are not related. Thus the answer is: (3) two independent samples.
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