ECO220Y1 Lecture Notes - Lecture 2: Descriptive Statistics, Dell, Statistical Inference

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ECO220Y1 Full Course Notes
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[sample] n = size, so able to get all the info from the sample. Read chapter 3 learn how to select good representative samples. Assumptions: know that a sample is only part of a population. The sample is a good representation of the population. Excel is one of the many software to do this: the sample size is what matters, not the population size. Error and the con dence drive the size of the sample. 3. 2 how do we select a sample in practice: simple random sample (srs) -most commonly used. We use a computer software randomly select the sample which depends on different situations, and make sure everyone in the system has an equal chance to be selected: strati ed sample -better results and also used commonly. Want the sample to look like the population. A sample is selected so that the sizes of subsamples re ects the sizes in the population.

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