MCS 3030 Lecture Notes - Lecture 6: Aftershave, Sampling Frame, Sample Size Determination
9 Nov 2016
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Document Summary
Why use a sample: saves money, saves time and provides timely answers, may be more accurate (e. g. non-sampling errors become dif cult to manage, survey may make respondents sensitive to subject matter. Steps in sampling process: de ne the population, elements, units, extent, time. 2: determine sample size, select sampling procedure, probability or non-probability sample, select sample, which includes element and unit. Element: is the unit about which information is sought. Sampling units: element(s) available for selection at some stage of the sampling process. Population (universe): the aggregate of all elements de ned prior to selection of the sample: elements, sampling units, extent (geographic coverage, time. Example 1: element after-shave users, sampling units households with male members 18 years or older, extent ontario. Thursday, october 27, 2016: time october 10-20, 2016. Example 2: element chemical engineers, sample units companies purchasing over k of chemicals per year, then chemical engineers, extent canada, time july, 2015.
