Statistical Sciences 1024A/B Study Guide - Final Guide: Standard Deviation, Dependent And Independent Variables, Scatter Plot
17 Oct 2013
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Chapter 1: summary: a data set contains information on a number of individuals. For each individual, the data gives values for one or more variables. A variable describes some characteristic of an individual, such as a person"s height, sex or salary: some variables are categorical and others are quantitative. A categorical variable places each individual into a category, such as male or female. Pie charts and bar graphs display the distribution of a categorical variable. Bar graphs can also compare any set of quantities measured in the same units. Some distributions have simple shapes, such as symmetric or skewed. Not all distributions have a simple overall shape, especially when there are few observations: outliers are observations that lie outside the overall pattern of a distribution. Always look for outliers and try to explain them: when observations on a variable are taken over time, make a time plot that graphs time horizontally and the values of the variable vertically.
