Answer
-9.768
Work Step by Step
$x̅_{1} = \frac{93 + ...... + 86}{7} = 89.857$
$x̅_{2} = \frac{118 + ...... + 98}{8} = 99.625$
Difference of means will give point estimate:
$x̅_{1} - x̅_{2} = 89.857 - 99.625 = -9.768$
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 - Applying the Concepts - Basic - Page 425: 9.18b
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