Chapter 1 Josh Lecture

Chapter 1 Josh Lecture - Chapter 1 Where Do Data Come From?...

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Chapter 1 Where Do Data Come From?
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Defining a Question Facebook is a recent social networking phenomenon and even influenced the last election. How much do we know about facebook? Question 1: What proportion of all USC students have a facebook account Question 2: Is the percentage of all USC students having a facebook account higher for males? How do we proceed at these questions?
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Population of Interest The population of interest is the group of individuals for we want to know more about What is the population of interest in the facebook problem? Consider the question: Do USC graduates make more money than Clemson graduates?
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Variables of Interest To answer the question posed, we need to measure or observe some characteristic of the individuals in the population These characteristics are called variables. Ex. Income, facebook account, gender Variables take on values Ex. $42,000, ‘yes’, ‘male’
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Types of Variables Qualitative – a quality, not numerical
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Chapter 1 Josh Lecture - Chapter 1 Where Do Data Come From?...

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