Essentials of Statistics (5th Edition)

Published by Pearson
ISBN 10: 0-32192-459-2
ISBN 13: 978-0-32192-459-9

Chapter 8 - Hypothesis Testing - 8-4 Testing a Claim about a Mean - Page 414: 4

Answer

95% confidence interval, should not be supported.

Work Step by Step

$\alpha$ of the confidence interval should be 0.05=1-0.95=1-95%, hence the confidence interval should be a 95% confidence interval. Hence the claim should not be supported because 90 sec is in the confidence interval.
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