Answer
29.82
Work Step by Step
$s^{2}_{p} = \frac{(20-1)25 + (10-1)40}{20+10-2}$
= $\frac{475 + 360}{28} = 29.82$
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: 9.8b
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