071 - How to get a good sample What do we want in a sample?...

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How to get a good sample 30/08/2007 09:03:00 What do we want in a sample? Representative As small as possible, yet still reliable Cheaper Definitions Unit: Single individual or object Population: Collection of all units of potential interest Sample: Collection of units upon which we actually take measurements Frame: A list of units from which the sample is chosen Census: A survey in which the entire population is measured Example #1: Gallup poll – Is America stressed out? Question: How often do you experience stress in your daily life? Responses: Frequently  – 39% Sometimes – 38% Methodology Telephone interviews with a randomly selected sample of 1,010 American  adults Conducted: o Mon., Dec. 11, 2006 though o Thurs., Dec. 14, 2006 Margin of error: +/- 3%
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Nielsen Media Research 30/08/2007 09:03:00 Example #2: Nielsen Media Research
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071 - How to get a good sample What do we want in a sample?...

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