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Sampling and Sample Size Determination - Strathmore …

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. -Eg. Student, employee, user, area, major news paper. What variables need further definition? (Items per construct) Sampling Frame (step 2) List of elements Sampling Frame error Error that occurs when certain Sample elements are not listed or available and are not represented in the Sampling frame Probability or Nonprobability (step 3) Probability Sample : A Sampling technique in which every member of the population will have a known, nonzero probability of being select

the relative population size of that stratum Disproportional Stratified Sample: The number of sampling units drawn from each stratum is allocated according to analytical considerations e.g. as variability increases sample size of stratum should increase

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