Answer
In this case, there is a "Selection Bias" because not everybody goes shopping on the Friday after Thanksgiving. Many people are spending time with their family during this weekend (including the Friday).
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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 18 - Inference in Practice - Apply Your Knowledge - Page 419: 18.3
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