This is a brief lesson on dot plot, histograms, box plots, and scatterplots.

1. Skill 17 Charts and Graphs
From Pages 105-109 in the book
Here is the description of what you need to know about charts and graphs.
There are some newer types of graphs in this lesson. Most of you are skilled at bar
graphs and circle graphs. We will concentrate on dot plots, histograms, box and
Whisker plots, and scatter plots.

2. Dot Plots
Some observations about this dot plot: The scores are 0,0,0,0,1,2,2,3,3,3,4,4,5,5,5.
The scores are stacked so that there are three 5s so three dots are stacked over the 5.
We can find the median score by finding the middle dot. Here it is 3. We can find this
Without listing the scores. Just count to the middle of 15 scores which would be the
8th score---namely, 3.
To answer the question above, we just need to see where the 5 passing scores are.
That would the all the 5s and 4s. So, the passing score is 4.
The mistake made by the student’s claim in the problem was to start at the bottom of
the scores instead of the top. The passing scores are at the top of the plot.

3. Histograms----These graphs are like bar graphs except the bars are jammed
up against each other instead of having some space between the bars.
Most of you have used bar graphs enough so that we will just let this example
Speak for itself.
What percent played for 35 minutes? Read the graph to estimate 6%

4. This is a box and whisker plot or just box plot for short. The question
below is a true-false one you could answer after you understand these
Plots. See the next slide to learn about a simple box plot.

5. From page 106 in the book. Note—you don’t have to make one of
These on the test. Just read information from it.

6. The question below is a good one like you might see on the test.
Look at pages 106-107 for sample questions with answers at the bottom of
p. 107.

7. The graph below is a scatter plot. You can read information off the graph.
The next slide has questions concerning this graph. See pages 108-109 in your book
For these questions. If you are given a weight, find the dot above the weight
and read over to the Miles at the left. If you are given miles, use the vertical
Miles scale and read across to the dot and then down to the weight.
Scatterplots
Note—ignore the references to the line of best fit. It is not on the test.

8. Answers; 1. b 2. b 3. c 4. d 5. a