1. Organizing and Graphing Quantitative Data Sections 2.3 – 2.4

2. Frequency Distribution for Quantitative Data

3. Lists all the classes (intervals) and the # of values in each class (frequency). Class Boundary – midpoint between upper limit of one class and lower limit of next class. Class width = upper boundary – lower boundary. Class Midpoint = lower limit + upper limit 2

4. Example:

5. Constructing Frequency Distribution Tables Number of classes - usually 5-20. Class width. –To approximate class width: Largest value – smallest value Number of classes

6. Example: Start with Data

7. Frequency Distribution of Data

8. Relative Frequency Distribution

9. Histograms Classes on x-axis, frequencies/relative frequencies/percentages on y-axis. Truncation

10. Relative Frequency Histogram

11. Polygon Graph formed by joining midpoints of bars.

12. Frequency Distribution Curve As the # of data and classes increase the polygon becomes more of a smooth curve.

13. Shapes of Histograms Symmetric

14. Shapes of Histograms Skewed

15. Shapes of Histograms Uniform