STT 315 Study Guide - Midterm Guide: Multimodal Distribution, Decimal Mark, Outlier
20 Sep 2016
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Document Summary
It involves collection, analysis, interpretation, presentation, and organization of data. Units/ cases/ individuals: the items or the individuals from which/whom the data are collected are often. Variable: the characteristic or property of a unit on which we take measurements. Data are the observed values of the variable. There are some numerical data, such as phone number, order number, zip code etc. , which are used to identify or keep track of individuals/cases. Population: the complete set of all units that we are interested in studying, census. Collection of data from an entire population: parameters. A sample: a subset of the population, sample survey. Study of a sample: a statistic a value we compute from sample data. Descriptive statistics: involves methods of organizing, picturing and summarizing information from data. Inferential statistics: involves methods of using information from a sample to draw conclusions about the population. Central tendency: the tendency of the data to cluster, or center, about certain numerical values.
