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STAT 5615
Statistics in Research (I)
Introduction
Ott & Longnecker Chap 1; 2.12.4
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What is statistics?
Wikipedia:
STATISTICS
is a mathematical science
pertaining to the collection, analysis, interpretation or
explanation, and presentation of data.
Data collection: sampling
Data analysis: choose appropriate statistical tools
Interpretation: make inference (or make decision)
Presentation: describe data
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Determinism, Randomness and Uncertainty
Deterministic:
e.g.: USA has 50 states and one federal district
Random:
e.g.: final class size of STAT 5615 in this year
Uncertainty:
e.g.: I don’t how many will drop and how many will add
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Statistics and The Scientific Method
Scientific research aims to understand the attributes of
interesting phenomena.
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Use it to solve
any
problem,
even to find a good restaurant in Blacksburg
Here's how to do it:
Step 1:
State the problem
You cannot solve a problem until you know exactly what it is.
My Problem is  "I don’t feel like cooking and I don’t want pizza.
I want to find
a place to eat good food that I can afford".
Step 2:
Research the problem
What will it take to solve my problem?
What do I know, and need to know, about my problem?
To solve my problem, "I need find a good affordable restaurant".
Where should I go?
 Examine the possibilities.
 Eliminate poor choices.
 Consider likely choices.
Step 3:
Form a hypothesis
A possible solution to my problem.
The simplest solution is often the best solution!
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This note was uploaded on 09/11/2008 for the course STAT 5615 taught by Professor Pdu during the Fall '08 term at Virginia Tech.
 Fall '08
 PDU
 Statistics

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