Answer
Pooled S.D = $s_{p} =0.5989$
Work Step by Step
Pooled S.D = $s_{p} = \sqrt (\frac{(5-1)(0.8562)^{2} + (4-1)(0.6481)^{2}}{5+4-2})$
= $\sqrt (\frac{2.93 + 1.26}{7}) = 0.5989$
Statistics (12th Edition)
by McClave, James T.; Sincich, Terry T.
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
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