Chapter_1 STATS NOTES

# Chapter_1 STATS NOTES - Statistical Science 1024 Chapter 1...

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Unformatted text preview: Statistical Science 1024 Chapter 1 Picturing Distributions with Graphs Individuals and Variables: Examples Individual • students • M & M ’ s • dogs • 2 by 4’s – also called an experimental unit or sampling unit depending on the context Variable • age, height, grades • colour, weight • breed • breaking strength Types of Variables quantitative • Something that can be counted or measured for each individual and then added, subtracted, averaged, etc., across individuals in the population. • Example: How tall you are, your age, your blood cholesterol level, the number of credit cards you own. categorical • Something that falls into one of several categories. What can be counted is the count or proportion of individuals in each category. • Example: Your blood type (A, B, AB, O), your hair colour, your ethnicity, whether you paid income tax last tax year or not. Distribution of a Categorical Variable Example M&M’s plain chocolate candies • 30% browns, 20% each of yellows and reds and 10% each of oranges, greens, and tans Bar Charts • used for categorical variables • gives a visual display of the relative sizes of each category Undergraduate Enrolment at UWO 2007 – 2008 • UWO full- time: 19940 • U W O p a r t- time: 3096 • Colleges full-time: 5088 • Colleges...
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Chapter_1 STATS NOTES - Statistical Science 1024 Chapter 1...

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