SamplingMethods02-15-12

SamplingMethods02-15-12 - Sampling Methods Lora! Drawing...

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Sampling Methods Lora!
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Drawing Samples Population Sample complete  list of  persons/objects we want  to study Census? subset  of   population What are some examples of populations and samples?
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All ( Population ) the beers available at Stuff your Face: n=99 Sample the beers available at Stuff your Face: n=10 How would sampling methods affect
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Key Concepts in Sampling Sample : representative subset of population (universe) Representativeness : How closely a sample matches its population in terms of the characteristics we want to study Sampling Error : Degree to which a sample s characteristics differ from the population s characteristics
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Why does sampling matter? You want to be able to draw conclusions from your analysis that can be applied to the population of interest Sample of opinions General experience of all students Quality of class & Professor Generalizability (external validity) E.g.: RateMyProfessor.com
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Non-Probability Sampling Convenience sampling Use who is most closely available as participants.
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SamplingMethods02-15-12 - Sampling Methods Lora! Drawing...

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