STAT 2500 Lecture Notes - Lecture 2: Design Of Experiments, Statistical Unit, Qualitative Property
17 Dec 2018
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Document Summary
A series of actions or operations that transforms inputs to outputs. Quantitative data: measurements that are recorded on a naturally occurring numerical scale, measured on a numerical scale, number of defective items in a lot, salaries of ceos of oil companies, ages of employees at a company. Obtaining data: data from a published source, data from a designed experiment, data from an observationally study. Published source: book, journal, newspaper, website. Designed experiment: researcher exerts strict control over the units. Survey: a group of people are surveyed and their responses are recorded. Observation study: units are observed in natural setting and variables of interest are recorded. Data-collection method where the researcher exerts full control over the characteristics of the experimental units sampled. Typically involve a group of experimental units that are assigned the treatment and an untreated (or control) group. Data-collection method where the experimental units sampled are observed in their natural setting.
