unit 7 - Sampling: ItsMoretheMethod CRIM300...

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Click to edit Master subtitle style  2/10/11 Sampling:  It’s More the Method  CRIM 300 Unit 7: Fall 2010
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 2/10/11 Probability sampling -- 2 key advantages: Can generalize sample findings to a population Can estimate sampling error in the findings (how closely  the sample estimates the population, or precision) Non-probability sampling Cannot generalize sample findings to a population Two Types of Sampling
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 2/10/11 Population : all members of the large group of  interest to the study Sample : a small portion of the population included  in the study Sampling : process of selecting population  members into the sample Sampling Vocabulary
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 2/10/11 Probability Sampling Generalizing Findings
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 2/10/11 Generalizing Findings: 1.   Researcher is in control  of who is selected into  the sample and determines each population  member’s chance of selection into the sample  2.  AND each member of the population has some  chance  of selection into the sample (a non-zero  chance) Hallmarks of Probability 
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 2/10/11 Sampling Error: Difference between sample statistic and population parameter  (estimate of how close the sample statistic is to the population  parameter) Expressed by: Confidence level  (standard is 95%) – how confident you are that  the statistic accurately estimates the parameter Probability Sampling, cont’d.
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 2/10/11 7 Source: www.aapor.org/marginofsamplingerror Notes : true for populations of 10,000+ members; S=sample size;  MOSE=margin of sampling error (confidence interval)
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unit 7 - Sampling: ItsMoretheMethod CRIM300...

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