1. Histograms

2. Definition of a Histogram A Histogram displays a range of values of a variable that have been broken into groups or intervals. Histograms are useful if you are trying to graph a large set of quantitative data To make a Histogram, you divide the range of data into intervals of equal length, count the number of observations in each interval, and represent each interval with a bar indicating the number of observations.

4. Disenfranchisement Rates for all 50 States 08.124.96.69.2 1.517.13.91411.3 2.81.24.62.816.1 3.1310.3517.4 7.242.47.924.7 14.28.3414.30 1618.95.72.80.8 0.73.512.96.21.5 2.84.22.68.31.5 3.79.24.28.42.6

5. Step 1: Sort the Data from Lowest to Highest 02.647.914 02.848.114.2 0.72.84.28.314.3 0.82.84.28.316 1.22.84.68.416.1 1.5359.217.1 1.53.15.79.217.4 1.53.56.210.318.9 2.43.76.611.324.7 2.63.97.212.924.9

6. Step 2: Determine how many groups of data you want to have. Step 3: Determine the approximate range of the set of data Step 4: From Steps 2 and 3, determine the range of each individual group For example, we’ll use 5 groups 0% through 24.9% (approximately 25%) I decided to have 5 groups. The range is from 0% - 25%. 25% divided by 5 is 5%. So each group should have a range of 5%.

7. Step 5: Make a list of the groups you will be using. Step 6: Using your data, count how many numbers fall into each group Group 1: 0% - 5% Group 2: 5% - 10% Group 3: 10% - 15% Group 4: 15% - 20% Group 5: 20% - 25% Group 1: 0% - 4.99% Group 2: 5% - 9.99% Group 3: 10% - 14.99% Group 4: 15% - 19.99% Group 5: 20% - 25% 25 12 6 5 2

8. Step 7: graph each group 25 12 6 5 2