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# Chp2 - Module 2 Types of Data and Graphical Summaries Data...

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Unformatted text preview: Module 2 Types of Data and Graphical Summaries Data Types and Graphical Displays Objectives : Be able to • distinguish types of data • select appropriate graphical methods • identify key characteristics of a graph • identify misleading characteristics of a graph Suppose you are operations manager for Mars company. Let’s begin with some questions: 1. What is the average net weight of a bag? 2. How much variation is there in bag weights? 4. What is the average number of M&Ms in a bag? 3. What proportion of bags weigh less than the advertised net weight? 5. Is the proportion of red M&Ms greater than the proportion of blue M&Ms? First Principles The problem must be well-defined, and the question is well stated. A problem clearly defined is half solved. M&M Data Collection Instructions: 1. Record the gross package weight. ____ 2. Predict the number of M&Ms in your package. ____ 4. Record the empty package weight. ____ 3. Remove M&Ms one-by-one and record number of each color First Principles Assume the data are ‘dirty’. Cleaning data may take 80% of your time. After we collect data, then what? Organize / Summarize Data Graphical Numerical First Principles Know what TYPE of data you are analyzing. The type of data drives the analysis. Vocabulary : Variable Any measurable characteristic of a person or thing....
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Chp2 - Module 2 Types of Data and Graphical Summaries Data...

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