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1_Introduction - STAT 5615 Statistics in Research(I...

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1 STAT 5615 Statistics in Research (I) Introduction Ott & Longnecker Chap 1; 2.1-2.4
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2 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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3 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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4 Statistics and The Scientific Method Scientific research aims to understand the attributes of interesting phenomena.
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5 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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