Stat Test 1 Study Guide

Stat Test 1 Study Guide - I ndividuals objects described by...

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Individuals – objects described by a set of data Variable – any characteristic of an individual Categorical Variable – places an individual into one of several groups or categories o Bar graphs, Pie charts, Pareto Chart (best) Quantitative Variable – takes numerical values that can be placed in arithmetic functions o Stemplots, Histograms (best) Variable distribution – tells us what values it takes and how often Exploratory Data Analysis – using statistical tools and ideas to analyze and describe sets of data Pareto Chart – a bar graph whose categories are ordered from most frequent to least frequent Histogram – a type of bar graph that illustrates the frequency distribution of a set of data Shape of a graph – single peak, double peak, symmetric, skewed Center – is it near the midpoint or mean? Spread – range of data Stemplot – “stem” of all but rightmost digits and “leafs” of rightmost digits depicting a bar- like graph (work better for smaller sets of data while histograms are best for large data sets) Time Plot – plots observation based on time observed with time always on the x-axis
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