ISDS 2000 Chapter : Chapter 2 Outline Updated 0810
15 Mar 2019
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Document Summary
Chapter 2: presenting data in tables and charts. See page 1 of text (before the title page) for the roadmap. The two types of variables are: categorical variables (also known as. Qualitative) have values that can be placed into categories (yes/ no; Defective/not defective): numeric variables (also known as. Quantitative) yield values that represent quantities (weight, salary, return-on-investment, gpa, # of children): discrete result of counting, continuous measurements within an interval can take on infinitely many values. Example: taken from an excel spreadsheet containing data collected from the fall 2006 isds 2000 course. In this form, trends and characteristics are not easily detectable as there can sometimes be millions of pieces of data. We want to summarize/reduce the data to a form which is more easily interpreted and which will aid in decision-making. Example: i recorded the number of students in each of the following academic majors and wanted to summarize:
