1. Lesson 2.1.1 Concept: Dot Plots and Bar Graphs
Vocabulary: (page 18 Toolkit)
Dot Plot - A way of displaying data that has an order and can be placed on a number line.  Dot plots are generally used when numerous pieces of data fall on most values.

2. Vocabulary: (page 18 Toolkit)
Bar Graph - Each bar stands for all of the elements in a single distinguishable category (such as “red”).  Usually all of the bars are the same width and separated from each other.
Venn diagram - A type of diagram used to classify objects that is usually composed of two or more overlapping circles representing different conditions.

3. What does this organization of data tell us? What does it not tell us?
In this lesson, you will use multiple ways to visualize information and decide which ways of visualizing are better for various types of information.  Consider these questions as you work through this lesson:
What does this organization of data tell us? 
What does it not tell us?
Is there a more useful way to visualize this information?
# 1. HOW MANY PETS?
Many people have pets.  Some people have many more than others.  Some people have none.
Write your initials on one of the sticky dots.  Place a sticky dot above the number of pets you have on the class dot plot.  If there are dots already over your number, place yours directly above them so that all of the dots form a neat “tower” over that number.
Which number of pets has the most occurrences in your class?  Which has the fewest? 
Can you tell by looking at the dot plot whether anyone has the same type of pet(s) as you?  Why or why not? 
Before class, create two large posters as described below.
For the number of pets dot plot (problem 2-1), label the horizontal axis starting with the number 0, but leave the right open-ended.  No vertical axis is needed.

4. Does the order of the bars matter on a bar graph?
# 2. CATS AND DOGS
In the previous problem you looked at the number of pets that your classmates had.  What if you want to know the types of pets people have?
For this activity, place your initials on two sticky dots.  Then place one sticky dot on the class bar graph and one on the Venn diagram (shown below right).  Then answer the questions below.
Were you able to place your dot easily on both graphs?  Was there anyone who had a hard time placing their dot on either of the graphs?  Explain.
Is there any information that is easier to see from looking at the bar graph?  The Venn diagram?
What kinds of information are best represented in bar graphs?  Venn diagrams?
Does the order of the bars matter on a bar graph?
For problem 2-2, prepare two large graphs, one bar graph labeled “Pets” as well as a Venn diagram with the same labels.  Examples of these graphs are provided in the problem statement for problem 2-2.

5. 3. Given the data in the table below, create a graph
3. Given the data in the table below, create a graph.  Decide if a dot plot, bar graph, or Venn diagram will work best.

6. 4. Mr. Reed surveyed his class to see how many siblings his students had. 
Create a graph of the data he collected, shown below.  Decide if a dot plot or bar graph will work best.
1, 0, 2, 2, 3, 1, 1, 2, 0, 0, 1, 1, 1, 2, 1, 5, 1, 3, 2, 0, 1, 2, 1, 1, 1, 2, 1 1 2 3 4 5

7. 5. LEARNING LOG
Title this entry “Bar Graphs and Venn Diagrams” and label it with today’s date.
In your Learning Log ( on page 9 of your Toolkit), explain how bar graphs are similar to and different from dot plots.  What additional information can a Venn diagram provide? 

8. Tonight’s homework is…
2.1.1 Review & Preview, problems #6 - #10.
Label your assignment with your name and Lesson number in the upper right hand corner of a piece of notebook paper. (Lesson 2.1.1)
Show all work and justify your answers for full credit.