Lecture 1 notes - Chapter 1 INTRODUCTION 1.1 What is/are...

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Chapter 1 INTRODUCTION 1.1 What is/are Statistics? Collection and analysis of data. Statistics is ubiquitous. 1.2 Purposes: Descriptive versus Inferential Statistics 1.3 Populations, Samples and Variables 1.4 Statistics and Engineering 1
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1.1 WHAT IS STATISTICS Collections of data. Specially calculated numbers (e.g. averages) that characterize a collection of data. Discipline – a set of methods of inquiry. Ingredients: 1) Collection of data (a) By observation (b) By designed experiment 2) Analysis of the data (a) Graphical and numerical summarization (b) Making decisions and inferences Often we use mathematical models to help with the analysis – this involves a branch of mathematics called probability theory. Key idea is randomness. Some physical laws are deterministic like F = ma or Q = msθ. What about: tossing a coin opinions on gun control life length of a light-bulb The statapult Applet: Red/blue rectangles: selecting random binary digits 2
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1.2 PURPOSE OF STATISTICS Descriptive statistics: Methods used to summarize or describe our “collection of data”. Help others to
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Lecture 1 notes - Chapter 1 INTRODUCTION 1.1 What is/are...

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