Answer
$t^*=2.485$.
Work Step by Step
The critical value of a $98\%$ confidence interval based on the $t(25)$ distribution is given in the row $df=25$ and in the column with $c=98\%$. Thus $t^*=2.485$.
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: 20.3b
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