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Unformatted text preview: , 2014 18 / 32 What are data? Data Display  Visualization Data Display/Visualization Professor: DaiTrang Le Chapter 1 – Introduction to Data January 8, 2014 18 / 32 What are data? Data Display  Visualization Data Display/Visualization Professor: DaiTrang Le Chapter 1 – Introduction to Data January 8, 2014 18 / 32 What are data? Data Analysis Data Analysis Professor: DaiTrang Le Chapter 1 – Introduction to Data January 8, 2014 19 / 32 What are data? Data Analysis Data Analysis Professor: DaiTrang 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: DaiTrang 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: DaiTrang 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: DaiTrang 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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 Spring '14

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