Answer
$t^*=2.353$.
Work Step by Step
The critical value of a one-sided test with level $\alpha=0.05$ based on the $t(3)$ distribution is given in the row $df=3$ and in the column with $\alpha=0.05$. Thus $t^*=2.353$.
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 20 - Inference about a Population Mean - Apply Your Knowledge - Page 458: 20.3a
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