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# Line Plots & Dot Plots

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by

## Sarah Majors

on 17 March 2015

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#### Transcript of Line Plots & Dot Plots

Example:
Heart Rate
Mia was thinking about joining the middle school track team. She read that Olympic athletes have lower resting heart rates than most people. She wondered about her own heart rate and how it would compare to other students. Mia was interested in investigating the statistical question, "What are the heart rates of the students in my class?"

This type of line plot can easily be converted to a histogram.
"A picture is worth a thousand words"
The old saying,
Now you try
Complete Line Plots: Worksheet 1

Complete Line Plots: Worksheet 2
Line Plots
or Dot Plots
Simplest and easiest graph to create
2 dimensional graph that uses an "x" or a ""
Example:
Unit 3: Statistics
Line Plots & Dot Plots

Dot Plot Example
Heart rates are expressed as bpm (beats per minute. Mia knew her resting heart rate was 80bpm and she found the heart rates for the other 22 students in her class:
89 87 85 84 90 79 83 85 86 88 84 81 88 85 83 83 86 82 83 86 82 84
Mia decided to make a dot plot to show the different rates. She drew a number line and started numbering from 78 to 90. She then placed a dot above the number line for each heart rate, if there was already a dot above the number she added another dot above the one that was already there.
is never more true than in mathematics.
Charts and graphs are the pictures that we use to show comparisons between groups, to help explain to our bosses why we should pursue a certain option, and to help us figure percentages that make up certain groups.

Let's first see what you know about these kinds of graphs

Unit 4: Statistics
This means that one chart or graph cannot possibly do everything we need. Instead, math has devised many different charts and graphs in order to make our points more convincingly.
In this unit we will cover the following type of graphs:

Line Plots/Dot Plots
Bar Graphs
Histograms
Line Graphs
Scatterplots
Circle Graphs
Stem-and-Leaf Displays
Box and Whisker Plots
Once you are in the padlet you will add your name and enter what you know or think you know about a specific graph. Do not repeat what someone else has already said.
There are two versions of the line plots. One version looks similar to a bar graph while the other version is graphed above a number line. Both are simple graphs that show how many times the event occurred.
Steps
1. Draw a line that will be long enough to show all groups
Let's try one!
Your principal is considering whether to offer soccer as a sport in your school. She wants your class to survey the school and present her with a simple graph to show for each grade level how many male and female students are interested in participating in soccer.
Example (cont'd)
Here is a table that shows the data
The second type of line plot is used primary in statistics and is graphed above a number line.
Line plot that resembles a bar graph
Contains data consisting of words,
not all numbers

Must include:
Label for each column
Horizontal title for column labels
2. Place the labels for each group below the line (the spacing must be the same).
3. Below the labels, place the horizontal title that is the name of the group the labels come from.
4. Look at the data in your table and determine if you will use an "X" for one of each item or if one "X" will represent a multiple of each item.
5. Place the correct number of "X's" above each label. Create a legend to show how many each "X" stands for.
6. Title the plot appropriately with a name that represents what is being shown with the "X's"
Your survey of each grade level found out that there are six males and five females in the sixth grade interested, 10 males and nine females in the seventh grade interested and eight males and 12 females in the eighth grade interested.
Your line plots would look like this:
Then each data value is represented by an "X" or "" above the number line. One "X" is plotted for each data value.
Must also include:
Title
Legend (tells what each "X" or "" stands for
* This type of line plot resembles a bar graph and can easily be converted into a bar graph
Math Achievement Test Scores for a sample of 50 Seventh graders.
75 48 46 65 71 49 61 51 57 67
49 84 85 79 85 83 55 69 88 57
89 55 61 72 64 67 60 77 51 63
61 68 54 63 98 54 53 71 84 71
79 75 65 50 41 65 77 71 63 77
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