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Sampling and Sample Size Determination

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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.

Cluster Sampling example You are asked to create a sample of all Management students who are working in Lethbridge during the summer term There is no such list available Using stratified sampling, compile a list of businesses in Lethbridge to identify clusters Individual workers within these clusters are selected to take part in study

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