文档介绍：Introductory
STATISTICS
9TH EDITION
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Introductory
STATISTICS
9TH EDITION
Neil A. Weiss, .
School of Mathematical and Statistical Sciences
Arizona State University
Biographies by Carol A. Weiss
Addison-Wesley
Boston Columbus Indianapolis New York San Francisco Upper Saddle River
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On the cover: Hummingbirds are known for their speed, agility, and beauty. They range in size from the smallest
birds on earth to several quite large species—in length from 2 to inches and in weight from to ounce.
Hummingbirds flap their wings from 12 to 90 times per second (depending on the species) and are the only birds
able to fly backwards. Normal flight speed for hummingbirds is 25 to 30 mph, but they can dive at speeds of around
60 mph.
Cover photograph: Hummingbird, C iDesign/Shutterstock
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