Answer
$\approx1.779$.
Work Step by Step
$t=\frac{\overline{x_1}-\overline{x_2}}{\sqrt{s_1^2/n_1+s_2^2/n_2}}=\frac{5.16-3.47}{\sqrt{3.5^2/18+2^2/18}}\approx1.779$.
The Basic Practice of Statistics 7th Edition
by Moore, David S.; Notz, William I.; Fligner, Michael A.
Published by
W. H. Freeman
ISBN 10:
146414253X
ISBN 13:
978-1-46414-253-6
Chapter 21 - Comparing Two Means - Chapter 21 Exercises - Page 510: 21.32b
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