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110_lec01AND02_Sample_Surveys

110_lec01AND02_Sample_Surveys - Statistics DATA INSIGHT...

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Statistics DATA INSIGHT CONCLUSIONS
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Anecdote vs Data Anecdote Striking story Sticks in our minds Focuses on one or a few incidents Data Collection of information Systematically describes an overall picture
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Anecdote vs Data Book Example: Research Question: Does living near power line cause leukemia in children? Data: National Cancer Institute spent 5 yrs and $5 million gathering data Result: No connection between between leukemia and exposure to magnetic fields of the kind produced by power lines. Report: Editorial reported ‘It is time to stop wasting our research resources.’ Anecdote: TV News Report Report: Investigation with articulate mother whose child has leukemia and who happens to live near a power line. Which story is more appealing? How many incidents is it based on?
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Where Data Come From Single most important fact about any statistical study! The first thing you ask when someone throws a number at you. A little vocabulary Individuals:objects described by a data set. People, households, animals, potato chips Variable: characteristic of an individual Numerical: height, number of children under 5, calories, heart-rate Non-numerical: sex, religion, color, crispness, religion
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How Can We Collect Data? Observational Study describes some group or situation. Example – sample surveys.
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