#### Answer

t=-2.36

#### Work Step by Step

$t=\frac{\bar{x}-\mu}{\frac{s}{\sqrt n}}=\frac{7.15-8}{\frac{2.28}{\sqrt {40}}}=-2.36$

Published by
Pearson

ISBN 10:
0321836960

ISBN 13:
978-0-32183-696-0

t=-2.36

$t=\frac{\bar{x}-\mu}{\frac{s}{\sqrt n}}=\frac{7.15-8}{\frac{2.28}{\sqrt {40}}}=-2.36$

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