Chapter 1- Introduction to Data

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Unformatted text preview: , 2014 18 / 32 What are data? Data Display - Visualization Data Display/Visualization Professor: Dai-Trang Le Chapter 1 – Introduction to Data January 8, 2014 18 / 32 What are data? Data Display - Visualization Data Display/Visualization Professor: Dai-Trang Le Chapter 1 – Introduction to Data January 8, 2014 18 / 32 What are data? Data Analysis Data Analysis Professor: Dai-Trang Le Chapter 1 – Introduction to Data January 8, 2014 19 / 32 What are data? Data Analysis Data Analysis Professor: Dai-Trang Le Chapter 1 – Introduction to Data January 8, 2014 19 / 32 What are data? Data Analysis Questions about Data Which of the following questions should be asked when developing an understanding of data? A. What variables were measured? B. How were the variables measured? C. Who collected the data? D. Why were the data collected? E. All of these questions were important Professor: Dai-Trang Le Chapter 1 – Introduction to Data January 8, 2014 20 / 32 Collecting Data to Understand Causality Population vs. Sample A population is the collection of any complete group with at least one characteristics in common. Information about the population is usually the goal; but may not be feasible to collect. (sometimes impossible) A sample is a subset of the population. A sample is usually used to get a partial understanding of the population . A good sample is a representative of the population from which it was selected. ”"An approximate answer to the right problem is worth a good deal more than an exact answer to an approximate problem." Jon Tukey Professor: Dai-Trang Le Chapter 1 – Introduction to Data January 8, 2014 21 / 32 Collecting Data to Understand Causality Population vs. Sample A population is the collection of any complete group with at least one characteristics in common. Information about the population is usually the goal; but may not be feasible to collect. (sometimes impossible) A sample is a subset of the population. A sample is usually used to get a partial understanding of the population . A good sample is a representative of the population from which it was selected. ”"An approximate answer to the right problem is worth a good deal more than an exact answer to an approximate problem." Jon Tukey Professor: Dai-Trang Le Chapter 1 – Introduction to Data January 8, 2014 21 / 32 Collecting Data to Understand Causality Population vs. Sample A population is the collection of any complete group with at least one characteristics in common. Information about the population is usually the goal; but may not be feasible to collect. (sometimes impossible) A sample is a subset of the population. A sample is usually used to get a partial understanding of the population . A good sample is a representative of the population from which it was selected. ”"An approximate answer to the right problem is worth a good deal more than an exact answe...
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