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Lecture 1

STAT 2507 Lecture Notes - Lecture 1: Statistical Unit, Univariate, Descriptive Statistics

Course Code
STAT 2507

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Stats- chapter 1
Descriptive statistics: science of summarizing and describing the important characteristics of a
set of data
Inferential Statistics: science of using information obtained from a sample to infer about the
characteristics of a population of interest
Population: set of entire collection of units
Sample: subset of the population selected in some prescribed manner
Variable: characteristic that changes or varies over times or for different individuals or objects
under consideration
Experimental unit: individual or object on which a variable is measured. Single measurement
or data value is obtained when a variable is actually measured on an experimental unit
Exercise 1
Population: all undergrad students at this university
Sample: five students
Experimental unit: a student
Measurements: GPA, Gender, Major, Credits
Types of data
Univariate data: obtained when a single variable is measured on a single experimental
Bivariate data: obtained when two variables of measured on a single experimental unit
Multivariable data: obtained when more than two variables are measured
Types of variables: qualitative or quantitative
Qualitative (Categorical):
o measure a quality or characteristic on each experimental unit
o measurements of qualitative variables belong to one of several categories
Political affiliation: Liberals, Conservatives, NDP, Green,
Colour of a car
Size of t-shirts: XS, S, M, L, XL
Racers classified as coming in 1st, 2nd, 3rd, etc
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