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Think Stats

If you know how to program, you have the skills to turn data into knowledge using the tools of probability and statistics. This concise introduction shows you how to perform statistical analysis computationally, rather than mathematically, with programs written in Python. You'll work with a case study throughout the book to help you learn the entire data analysis process—from collecting data and generating statistics to identifying patterns and testing hypotheses. Along the way, you'll become familiar with distributions, the rules of probability, visualization, and many other tools and concepts | Think Stats Allen B. Downey OREILLY Beijing Cambridge Farnham Koln Sebastopol Tokyo Think Stats by Allen B. Downey Copyright 2011 Allen B. Downey. All rights reserved. Printed in the United States of America. Published by O Reilly Media Inc. 1005 Gravenstein Highway North Sebastopol CA 95472. O Reilly books may be purchased for educational business or sales promotional use. Online editions are also available for most titles http my.safaribooksonline.com . For more information contact our corporate institutional sales department 800 998-9938 or corporate@oreilly.com. Editor Mike Loukides Production Editor Jasmine Perez Proofreader Jasmine Perez Printing History June 2011 First Edition. Cover Designer Karen Montgomery Interior Designer David Futato Illustrator Robert Romano Think Stats is available under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License http creativecommons.org licenses by-nc-sa 3.0 legalcode . The author maintains an online version at http www.greenteapress.com thinkstats thinkstats.pdf. Nutshell Handbook the Nutshell Handbook logo and the O Reilly logo are registered trademarks of O Reilly Media Inc. Think Stats the image of an archerfish and related trade dress are trademarks of O Reilly Media Inc. Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear in this book and O Reilly Media Inc. was aware of a trademark claim the designations have been printed in caps or initial caps. While every precaution has been taken in the preparation of this book the publisher and author assume no responsibility for errors or omissions or for damages resulting from the use of the information contained herein. ISBN 978-1-449-30711-0 LSI 1309368976 Table of Contents Preface. ix 1. Statistical Thinking for Programmers.1 Do First Babies Arrive Late 2 A Statistical Approach 3 The National Survey of Family Growth 3 Tables and Records 5 Significance 7