Statistics (12th Edition)

Published by Pearson
ISBN 10: 0321755936
ISBN 13: 978-0-32175-593-3

Chapter 9 - Inferences Based on Two Samples - Exercises 9.1 - 9.29 - Learning the Mechanics - Page 423: 9.9a

Answer

Pooled S.D = $s_{p} =0.5989$

Work Step by Step

Pooled S.D = $s_{p} = \sqrt (\frac{(5-1)(0.8562)^{2} + (4-1)(0.6481)^{2}}{5+4-2})$ = $\sqrt (\frac{2.93 + 1.26}{7}) = 0.5989$
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