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Statistics (266)
STAC50H3 (1)
Lecture

# Chatpter 1.docx

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School
University of Toronto Scarborough
Department
Statistics
Course
STAC50H3
Professor
Chris Bovaird
Semester
Summer

Description
Chapter 1- Looking at Data Distributions Introduction : A statistical analysis starts with a set of data. We construct a set of data by first deciding what cases or units we want to study. For each case, we record information about characteristics that we call variables. Definitions: Cases are the objects described by a set of data. Cases may be customers, companies, subject in a study, or other objects. A label is a special variable used in some data sets to distinguish the different cases. A variable is a characteristic of a case. Different cases can have different values for the variables. Categorical and Quantitative Variables A categorical variable places a case into one or several groups or categories. A quantitative variable takes numerical values for which arithmetic operations such as adding and averaging make sense. The distribution of a variable tells us what values it takes and how often it takes these values. 1.1Displaying Distributions with Graphs Exploratory data analysis: statistical tools and ideas help us examine data in order to describe their main features. Two strategies that help us organize our explorati
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