1. Graphing
Packet #20

2. Types of Graphs Bar chart/graph Pie chart/graph Line chart/graph
Consists of parallel, vertical bars or rectangles, with lengths proportional to the frequency provided by the data.
Pie chart/graph
Circular graph having radii, lines, dividing the circle into sectors
Line chart/graph
Created by connecting s series of data points together with a line.

3. Bar Charts
Histogram

4. Histogram Introduced by Kael Pearson in the 1890’s.
Bar chart that displays a frequency distribution using rectangles.
May be used to display grouped frequency.
Special Note
The area of each rectangle is proportional to the frequency represented.

5. Pie Charts

6. Introduction Useful for representing proportions.
Individual data values of the X variable are represented as the “wedges” of the pie.

7. Pie Chart—Counts Also known as a frequency pie chart
Interprets data like a histogram.
The frequencies are represented as pie slices.

8. Pie Chart—Values Also known as the data pie chart
Selected variable will be represented by consecutive slices of the pie
0’s and negative values cannot be represented.

9. Line Graphs/Charts

10. Types of Line Graphs Kurtosis
Graphical measure of variability among scores/data
Three types
Leptokurtic
Small range with a very peaked mode
Platykurtic
Large range with a low mode
Mesokurtic
Bell-shaped with gradual slopes

11. Types of Line Graphs II Skew Graphical measure of extreme scores
Two types
Negative
Extreme scores on the left
Positive
Extreme scores on the right

12. Kurtosis
Leptokurtic
Platykurtic

13. Kurtosis Mesokurtic

14. Skew
Negative
Positive

15. To Come in Correlation Packet
Scatter Plots
To Come in Correlation Packet