The Basic Practice of Statistics 7th Edition

Published by W. H. Freeman
ISBN 10: 146414253X
ISBN 13: 978-1-46414-253-6

Chapter 18 - Inference in Practice - Apply Your Knowledge - Page 420: 18.5

Answer

See below.

Work Step by Step

$95\%$ of individual days doesn't really make sense, thus this cannot be the conclusion. The restaurant we work at is not exactly the same as the one where the experiment happened. And also, confidence intervals are for the average tip in a large number of tips.
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