1 / 22

CHAPTER 3 Graphical Presentations

CHAPTER 3 Graphical Presentations. Types of Variables. Qualitative - categories which can be named - Classification : Fr., So., Jr., Sr. - Occupation Quantitative - “meaningful” numerical values - SAT score - Height, Weight, Age.

lee-winters
Download Presentation

CHAPTER 3 Graphical Presentations

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CHAPTER 3 Graphical Presentations

  2. Types of Variables • Qualitative - categories which can be named - Classification : Fr., So., Jr., Sr. - Occupation • Quantitative - “meaningful” numerical values - SAT score - Height, Weight, Age

  3. Quantitative Variables may be discrete or continuous • Discrete - possible values for the variable can be listed - number of brothers - number of Heads out of 10 tosses of a coin • Continuous - different values can be arbitrarily close - height - weight

  4. Blood Group Data – “raw data” Patient #Blood Type 1 O 2 A 3 A 4 O 5 B 6 O 7 A 8 AB . . . . . .

  5. Pie Chart - Blood Group Data

  6. Bar Chart - Blood Group Data

  7. Ways to Display Quantitative Data • APTITUDE TEST scores for 20 applicants : • Raw Data: • 68, 72, 91, 47, 52, 75, 63 55, 65, 35, 84, 45, 58, 61 69, 22, 46, 55, 66, 71 • Ordered List: 22, 35, 45, 46, 47, 52, 55 55, 58, 61, 63, 65, 66, 68 69, 71, 72, 75, 84, 91

  8. Dot Plot for Aptitude Data Score

  9. Stem-and-Leaf Diagram

  10. HISTOGRAM for quantitative data “sort of like” bar chart represents % by area

  11. Density Scale-sets height of block so that resulting area is % in that class interval % in class intervaldensity scale ( % per unit) = length of class interval

  12. HISTOGRAM --for quantitative data -- represents % by area (use density scale)-- total area in blocks is 100% -- each histogram should have: - title - axes should be “numbered” and labeled BAR CHART --for qualitative data -- represents % by height Summary

  13. (what’s wrong with this histogram?) 40 55 80 95 20 70

More Related