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What is Statistics?

Presentation for the first day of class for business statistics
by

Enrico Secchi

on 13 September 2013

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Transcript of What is Statistics?

...and why do we care?
What Is Statistics?
"Statistics is the science of learning from data, and of measuring, controlling, and communicating uncertainty; and it thereby provides the navigation essential for controlling the course of scientific and societal advances."
"A collection of numerical information is called statistics"
Merriam-Webster Dictionary
Encyclopedia Britannica
DEFINITIONS
COLLECT DATA
EXPERIMENT
USE EXISTING DATA
RUN A SURVEY
HOW?
HOW MUCH?
We generally draw a
SAMPLE
from a
POPULATION
Inferential Statistics
is concerned with generalizing the information of the sample to the general population.
Descriptive Statistics
is concerned with summarizing the characteristics of the sample
The questions that we want to ask will impact the type of data that we collect
WHAT
KIND?
ANALYZE
INTERPRET
Do you accept or reject your hypothesis?
What conclusions do you draw?
PRESENT
Who is your audience?
What is your point?
WHAT IS IT FOR?
The Expansion of the Universe
Florence Nightingale's coxcomb plot
Davidian & Louis, Science 6 April 2012: Vol. 336 no. 6077 p. 12
Lind et al. (2012), Basic Statistics for Business and Economics, p. 3
Full transcript