The driver of Exercise 3 wants to know about tipping in general. So he recruits several other

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The driver of Exercise 3 wants to know about tipping in general. So he recruits several other drivers to participate in the experiment. Each driver randomly decides whether to phone customers before delivery and records the tip percentage. Is this experiment blocked? Is that a good idea?
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Stats Data and Models

ISBN: 978-0321986498

4th edition

Authors: Richard D. De Veaux, Paul D. Velleman, David E. Bock

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