1. By Ryan Beil and Chris Carlson
Histograms
RYAN
By Ryan Beil and Chris Carlson

2. Definition and Explanation
A Histogram is a representation of a frequency distribution by means of rectangles whose widths represent class intervals and whose areas are proportional to the corresponding frequencies.
Take the numbers: 1.2, 2.3, 2.5, 3.1, 3.5, 3.6, 3.7, 4.3, 4.5, 5.6, 6.7
1-1.99
1.2
2-2.99
2.3
2.5
3-3.99
3.1
3.5
3.6
3.7
4-4.99
4.3
4.5
5-5.99
5.6
6-6.99
6.7
Read definition. Go through data and representation in the graphics. RYAN

3. Definition and Explanation Continued
Take the numbers:
1.2, 2.3, 2.5, 3.1, 3.5, 3.6, 3.7, 4.3, 4.5, 5.6, 6.7
1-1.99
1.2
2-2.99
2.3
2.5
3-3.99
3.1
3.5
3.6
3.7
4-4.99
4.3
4.5
5-5.99
5.6
6-6.99
6.7
Go through graphics again, explain how it works into the graph. CHRIS

4. Definition and Explanation Continued
Proportional to Frequencies
Rectangles/Widths
A Histogram is a representation of a frequency distribution by means of rectangles whose widths represent class intervals and whose areas are proportional to the corresponding frequencies.
Read definition again. Explain each bold faced word and click for a label on the graph. RYAN
Frequency Distribution
Class Intervals

5. Uses of Histograms
Histograms are used in many different ways and forms.
United States Census
Graphing Demographics
Used when wanting to show a frequency of data for a specific interval or a group of intervals.
Read through and explain slowly. Give examples. CHRIS

6. What is Needed to Make a Histogram?
Intervals. (X Axis)
Frequencies for the intervals or interval groups (Y Axis)
Example: Living With Parents (100 People Surveyed Per Age Group)
16-25: 60 People
26-35: 40 People
36-45: 20 People
46-55: 15 People
56-65: 5 People
FAKE DATA. Explain what is needed to make a graph and how it relates to data. Explain graph. CHRIS
Interval
Frequency

7. How Long Does it Take Mrs. Ellwood’s 4th Period Class to do Homework?
Data:
0-30 Minutes
4 People
31-60 Minutes
8 People
61-90 Minutes
3 People
Minutes
2 People
Minutes
0 People
Minutes
REAL DATA. Explain data and compare it to the graph. RYAN

8. Histogram Question
Using the graph on the left, find the median and the mode of the data. Provide your answer in interval form.
Five new students join Mrs. Ellwood’s class in the middle of the school year. Three chose the interval and two chose the interval for the amount of time spent on homework. Would this cause the median to change? If yes, then to what value?
Click once for part A. Second click for Part B. A: Median and Mode is Minutes. B: Median is changed to Minutes. CHRIS for A. RYAN for B.

9. Advantages It displays a large range of data in a compact area.
Easy to compare data from different categories and intervals.
Histograms can show bell curves. (Example Below)
Explain each, especially bell curves. RYAN

10. Disadvantages
It can be more difficult to determine the exact values for data and intervals.
There is a restriction on the type of intervals and categories that can be used and compared.
Can be difficult to read with a large number of intervals.
Explain all, including the graphic. CHRIS

11. Bibliography Images: (In Order of Appearance) Information:
Information:
CHRIS

12. Histograms Definition and Explanation Definition and Explanation Continued Definition and Explanation Continued Uses of Histograms What is Needed to Make a Histogram? How Long Does it Take Mrs. Ellwood’s 4th Period Class to do Homework? Histogram Question Advantages Disadvantages Bibliography
Ask for questions. RYAN
Histograms