Duke STA 101 - Surveys (44 pages)

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Surveys



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Surveys

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Lecture Notes


Pages:
44
School:
Duke University
Course:
Sta 101 - Data Analy/stat Infer

Unformatted text preview:

Surveys FPP Chapter 19 Plan of Study Conducting good surveys is not trivial We will cover these three main topics today 1 Issues in questionnaire design 1 Methods for selecting units to survey 1 Administration of surveys Statistical Literacy Statistics are often used to validate arguments philosophies public policy decisions etc It behooves us to be educated consumers of statistics Lying with statistics There are three kinds of lies lies damned lies and statistics If you torture data enough it will tell you what you want it to Damned Lies and Statistics Untangling Numbers from the Media Politicians and Activists by Joel Best Statistics Concepts and Controversies by David Moore Statistical Literacy An example from Joel Best s book In dissertation prospectus a student reported the following that was found in a 1995 reputable peer reviewed journal Every year since 1950 the number of American children gunned down has doubled Best says that I think that it may be the worst that is the most inaccurate ever What s wrong with it social statistic Statistical Literacy Understand the measure Two reports in same newspaper 2 90 Teens sexual activity on the rise Teen s sexual activity on the decline First article avg age of first intercourse 17 2 females 16 5 males which was younger Second article avg number of partners 6 and frequency 3 per month which were lower Two analyses really tackled different question but conclusions presented the same way Always find out what variable is being measured when judging or making statistical conclusions Statistical Literacy Which U S states are the worst polluters E P A in 1993 ranked New Jersey 22 nd worst in the nation in release of toxic chemicals E P A used total pounds 38 6 million When using pounds per square mile New Jersey was the 4th worst in the nation The two analyses assess pollution but they use different variables Pay attention to variable used when judging statistical claims Statistical Literacy Statistics are no substitute



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