1. 2.2 More Graphs and Displays

2. I. Graphing Quantitative Data Sets
Stem and Leaf Plots:
Stem – left most digit
Leaf – right most digit(s)
- Similar to a histogram but still contains original data.
- Easy way to sort data.
- Stems must be in numerical order with no skipped
numbers. Leaves must also be in numerical order.
Page 49 – 50 Examples 1 & 2

3. I. Graphing Quantitative Data Sets
Dot Plot:
Each data entry is plotted using a point above a
horizontal axis.
- Allows you to:
1) see how data are distributed
2) determine specific entries
3) identify unusual data values
Page 51 Example 3

4. Now back to pg45 #23…
Make a stem and leaf….
Make a dot plot….

5. II. Graphing Qualitative Data Sets
Pareto Chart:
Vertical bar graph with bars in decreasing order which
helps highlight important data (used frequently in
business)
- Bars must touch!
Page 53 Example 5 and Try It Yourself 5

6. Practice Classwork: Page 56 #3 – 10 all
Homework: Page 57 – 58 #16, 19, 22

7. II. Graphing Qualitative Data Sets
Pie Chart:
A circle that is divided (proportional to frequency)
into sectors that represent categories
- Multiply relative frequency by 360° to create sectors
with a protractor
- Label sectors with percentages by changing relative
frequency decimals to percents
Page 52 Example 4 and Try It Yourself 4

8. III. Graphing Paired Data Sets
when each entry in one data set corresponds to one
entry in a second data set (x, y)
Scatter Plot:
Ordered pairs are graphed as points in a coordinate
plane. Used to show the relationship between two
quantitative variables.
Page 54 Example 6 & Try It Yourself 6

9. III. Graphing Paired Data Sets
Time Series Chart:
A graph that displays a data set composed of
quantitative entries taken at regular intervals over a
period of time.
Page 55 Example 7 & Try It Yourself 7

10. Practice  Classwork : Page 57 #11 – 14
Homework: Page 58 – 59 # 20, 24, 26