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Lecture

intro to statistics


Department
Geography
Course Code
GGR270H1
Professor
Damian Dupuy

Page:
of 1
Statistics Lecture
September 14, 2011
Descriptive Statistics
Way of organizing and summarizing data
Replaces large set of numbers with small summary measures-
such as finding the mean of the class test and summarizing them
in some way
Goal of techniques is to minimize information loss; pick the best
technique that gives the best summary of the data and doesn’t
lose as much information
Inferential Statistics
Links descriptive statistics to probability theory
Allows us to look at how good the results are
Population
Total set of elements [objects, persons, regions] under
examination
Ex. All potential voters in an urban area
It is usually noted as ‘N’
Sample
Subset of elements in the population
Smaller group which helps describe what’s going on in the bigger
picture
Try to predict the behaviour of the population by looking closely
at the sample
It is usually denoted as ‘n’
Samples don’t always have to be the same size