#### 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:
$x̅_{1} - x̅_{2} = 89.857 - 99.625 = -9.768$

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Published by
Pearson

ISBN 10:
0321755936

ISBN 13:
978-0-32175-593-3

-9.768

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