1. How do I create and interpret frequency tables and line plots?

2. Vocabulary
Frequency Table – a table that displays the number of times each item or category occurs in a data set.
Line Plot – a number line diagram that uses X marks to show the frequencies of items being tallied.

3. Line Plot
A line plot shows the spread of all the data on a number line.
Easily identifies the mode.
All line plots include:
- a title
- a horizontal line
- data displayed by use of X’s

4. Example of a Frequency Table How many books did you read this summer?
# of Books
Tallies
Frequency 1
llll 5 2 3
llll l 6 4 ll 7
students

5. Completed Line Plot
When the items being tallied are numbers, a line plot can be used to visually display numerical data. A line plot uses X marks above a number line to show the frequencies.
The X marks above the number line show the frequencies.
X X X X X X
X X X X X
X X X X X
The Number Line shows the number of books read.
X X X X
X X 1 2 3 4 5 6 7
Number of Books Read

6. Line Plot Example Number of sit-ups in a minute

7. Making a Frequency Table
What is your favorite food?
Spaghetti, Steak, Tacos, or Pizza
We can use our data to make a line plot.
Favorite Food
Tallies
Frequency
Spaghetti
Steak
Tacos
Pizza

8. Making a Line Plot steak taco pizza spag Food Tallies Frequency
Spaghetti
Steak
Tacos
Pizza
steak
taco
pizza
spag

9. Making a Frequency Table
How many TV’s do you have in your home?
0,1,2,3,4,5
# of TV’s
Tallies
Frequency 1 2 3 4 5
We can use our data to make a line plot.

10. Making a Line Plot
# of TV’s
Tallies
Frequency 1 2 3 4 5 1 2 3 4 5

11. Making a Frequency Table
How many pets do you have?
0, 1, 2, 3, 4, 5+
# of pets
Tallies
Frequency 1 2 3 4 5+

12. Making a Line Plot
# of pets
Tallies
Frequency 1 2 3 4 5+ 2 3 4 5+ 1

13. Variability in Data Distributions
Outliers-Unusually high or low values in a distribution.
Clusters-A group of data values with higher frequency than surrounding values.
Gaps-Areas in the scale where there is a lack of data values.