ECON 3300 Lecture Notes - Lecture 1: Simple Random Sample, Null Hypothesis, Sampling Distribution

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26 Aug 2016
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In chapter 1 we stated that statistical studies can be classified as either experimental or observational. In an experimental statistical study, an experiment is conducted to generate the data. An experiment begins with identifying a variable of interest. Then one or more other variables, thought to be related, are identified and controlled, and data are collected about how those variables influence the variable of interest. In an observational study, data are usually obtained through sample surveys and not a controlled experiment. Good sample designs are employed, but the rigorous controls associated with an experimental statistical study are often not possible. For instance, in a study of the relationship between smoking and lung cancer the researcher cannot assign a smoking habit to subjects. The researcher is restricted to simply observing the effects of smoking on people who already smoke and the effects of not smoking on people who already do not smoke.

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