1. histograms

2. histogram
A histogram is a type of bar graph used to display numerical data that have been organized into equal intervals. Histograms allow you to see how many pieces of data are in each interval. *** They are different from bar graphs in that they represent an interval and not just a number. Also, in a histogram the bars tough because the numbers represented are continuous.

3. Scales and intervals
Deciding on the scale and intervals is the most difficult part of constructing a histogram.
The scale must include all numbers in the data set.
The interval should organize the data to make it easy to compare.
Intervals on a histogram must represent the same range of numbers. For example, one interval cannot be 0-5 and the next Why?

4. Constructing a histogram
The table shows the number of daily visitors to selected state parks.
Draw a histogram to represent the data.
Daily Visitors to Selected State Parks
Visitors
Tally
Frequency
Make a frequency table to organize the data. Decide on your scale beforehand.
Draw and label a horizontal and vertical axis. The horizontal axis will show the intervals and the vertical axis will show the frequencies. Include a title.
For each interval, draw a bar to the height representing the frequency. Remember, the bars must touch on a histogram.

5. Complete Got It? and Guided Practice p. 874 in Groups