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Sampling and Sample Size Determination

Sampling and Sample size Determination Terms Sample Population Population element Census Why use a Sample ? Cost Speed Accuracy Destruction of test units Steps Definition of target population Selection of a Sampling frame (list) Probability or Nonprobability Sampling Sampling Unit Error Random Sampling error (chance fluctuations) Nonsampling error (design errors) Target Population (step 1) Who has the information/data you need? How do you define your target population? - Geography - Demographics - Use - Awareness Operational Definition A definition that gives meaning to a concept by specifying the activities necessary to measure it.

Sampling and Sample Size Determination . Terms •Sample •Population •Population element •Census . Why use a sample? •Cost •Speed •Accuracy •Destruction of test units . Steps •Definition of target population •Selection of a sampling frame (list) •Probability or Nonprobability sampling •Sampling Unit •Error

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pages.stat.wisc.edu

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