Chapter12 - Determining How to Select a Sample Basic...

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Click to edit Master subtitle style Determining How to Select a Sample
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Ch 12 22 Basic Concepts in Sampling Population: the entire group under study as defined by research objectives Researchers define populations in specific terms such as “heads of households located in areas served by the company who are responsible for making the pest control decision.”
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Ch 12 33 Basic Concepts in Sampling Sample: a subset of the population that should represent the entire group Sample unit: the basic level of investigation Census: an accounting of the complete population
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Ch 12 44 Basic Concepts in Sampling Sampling error: any error in a survey that occurs because a sample is used A sample frame: a master list of the entire population Sample frame error: the degree to which the sample frame fails to account for all of the population…a telephone book listing does not contain unlisted numbers
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Ch 12 55 Reasons for Taking a Sample Practical considerations such as cost and population size Inability of researcher to analyze huge amounts of data generated by census Samples can produce precise results
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Ch 12 66 Two Basic Sampling Methods Probability samples: ones in which members of the population have a known chance (probability) of being selected into the sample Non-probability samples: instances in which the chances (probability) of selecting members from the population into the sample are unknown
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Ch 12 77 Probability Sampling Methods Simple random sampling Systematic sampling Cluster sampling Stratified sampling
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Ch 12 88 Probability Sampling Methods
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Ch 12 99 Probability Sampling: Simple Random Sampling Simple random sampling: the probability of being selected into the sample is “known” and equal for all members of the population E.g., Blind Draw Method Random Numbers Method (see MRI 12.1, p. 335)
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Ch 12 1010 Probability Sampling: Simple Random Sampling Advantage: Known and equal chance of selection Disadvantages: Complete accounting of population needed Cumbersome to provide unique designations to every population member
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Ch 12 1111 Probability Sampling Systematic Sampling Systematic sampling: way to select a random sample from a directory or list that is much more efficient than simple random sampling Skip interval=population list size/sample size
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Ch 12 1212 Probability Sampling Systematic Sampling
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