STAT 3025Q Chapter 1: Ch 1 Populations Samples and Processes
26 Sep 2017
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Document Summary
Statistics - organizing/summarizing data and drawing conclusions from data. Population - collection of objects of interest. Consensus - when desired information is available of all objects in the population. Sample - subset of a population (good for when a consensus is infeasible) Ex. bearings from a particular production run as a basis for investigating whether bearings are conforming to manufacturing specifications, last year"s engineering graduates to obtain feedback about the quality of the engineering curricula. Categorical - the value of the characteristic is a category (ex. gender, type of malfunction) Variables - any characteristic whose value may change from one object to another in the population. Ex. x = brand of calculator owned by a student y = number of visits to a particular website during a specified period z = braking distance of an automobile under specified circumstances. Bivariate - observations are made on two variables. 212lb) x = component lifetime (numerical) y = reason for component failure (categorical)
