STAT 1350 Study Guide - Midterm Guide: Confounding, Observational Error, Statistic
3 May 2016
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Z=x-m/o or x=zo+m, moe = 1/ (n=samp. size), measured value = true value + bias + random error, outliers: iqr = q3-q1 high: q3 + 1. 5xiqr low: Individuals: the objects described by a set of data. Variables: any characteristic of an individual, can take different values for different individuals. Quantitative variable: takes numerical values for which arithmetic operations such as adding and averaging make sense. : places an individual into one of several groups or categories. Observational study: observes individuals and measures variables of interest but does not attempt to influence the responses (think: stand back and watch ). A survey is one type of observational study. Experiment: deliberately imposes some treatment on individuals in order to observe their responses (make the individuals do something in particular. ) The purpose of an experiment is to study whether the treatment causes a change in the response. Population: entire group of subjects about which we want info.
