STAT 8010 Lecture 2: lec2-Chapter 3
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Document Summary
Descriptive statistics is organizing, summarizing and describing data. Good descriptive statistics allow us to reduce large sets of measurements to a few summary values that provide a good rough picture of the original information. Types of variables: qualitative - the variable represents categorical information, quantitative - the variable represents a numerical scale. Methods of summarizing data: graphical techniques, numerical techniques. Graphical displays for: pie chart (one-way frequency table) Frequency table: bar graph (one-way frequency table) 2. The data listed in the table below is information on major volcanoes and their continent. The data listed in the table below is information on major volcanoes and their elevation. Frequency table for major volcanoes in the world. Major volcanoes in the world n o i t r o p o r. Stem-leaf display for elevation: unit = 1000 1|2 represents 12000. Stem and leaf display for life expectancies in 33 developed nations.