Data About Us (DAU)
Line Plot
Mode
Range
Median
Investigation 1
1. What does each “X” represent?
Number of letters in a name
2. How many names are represented on this line plot?
24
3. Why does the line plot start with 8 and end with 17?
Line Plot Rules
1. On the line plot, start with the
lowest value and end with the
highest value.
2. DO NOT SKIP NUMBERS.
3. Place x’s in a straight line going up
above the line itself.
9
10
11
12
13
14
15
16
Line Plot
13
Robin Williams ______
9
Clark Kent ______
13
Britney Spears ______
11
Paris Hilton ______
16
Justin Timberlake ______
1.
Count the number of letters in each name.
2.
Put an “x” to represent the number of letters in each name on the line
plot
9
10
11
12
13
14
15
16
Line Plot
Robin Williams 13
Clark Kent 9
Britney Spears 13
Paris Hilton 11
Justin Timberlake 16
1.
Count the number of letters in each name.
2.
Place numbers or ranges on the line plot
3.
Put an “x” to represent the number of letters in
each name on the line plot
X
9
X
X
X
10
11
12
13
X
14
15
16
y-axis: Labeled with Frequency
x-axis: Labeled with what the bars represent- usually the same as
the title
Title is added at the top
Bars represent what the x-axis is with a little bit more information.
Bar Graph
Robin Williams 13
Clark Kent 9
Britney Spears 13
Paris Hilton 11
Justin Timberlake 16
The Amount of Letters in the Actor’s Name
Frequency
2
1
0
9
10
11
12
Letters in a name
13
14
15
16
Mode
Put the values in order to make an organized list:
9
11
13
13
16
Mode: The most frequent value in a data set.
• The value that is repeated the most.
• Can have more than 1 mode.
• There can be “no mode”, but that doesn’t mean
that the mode is “0”.
Write numbers in order.
9
11
13
13
16
Range
9, 11, 13, 13, 16
Range: The difference between the highest value and the
lowest value. Must put the data in order.
The highest value is:
16
The lowest value is:
9
Difference:
7
Median
Median: The middle number
(midpoint) of a data set. Must
put the numbers in order.
• Whack, Whack
Median (odd)
9
11 13 13 16
How many values are there?
5
Divide the number of values in half or divide by 2.
What is the middle number?
13
5 ÷ 2 = 2.5
Median (even)
1. On the other graph paper, write these numbers in the
box.
9
11 13 17 18 18
2. Fold in half OR take the number of values and divide by 2.
So… 6 ÷ 2 = 3.
3. Are there 2 middle numbers?
4. 13 + 17 = 30 ÷ 2 =
5. And the answer is… ?
15
Median (whack, whack)
Put the values in order from least to greatest:
9
11
13
13
16
9
11
13
17
18
18
13 + 7 = 30
÷𝟐=
Complete page 2 in your
green packet.
Place answers on page 3.
If you do not finish, it
becomes homework!
Homework: Page 4
1.
2.
3.
4.
Make a line plot
Place “X’s” to represent the name lengths in Mr. Grey’s Class.
Label the numbers.
Add a title.
7
8
9
10
11
12
13
14
15
16
17
18
19
On page 3:
1. Make a line plot to organize the data.
2.
3.
4.
5.
6.
Write the data set in an organized list.
Find the mode of the data set.
Find the range of the data set.
Find the median of the data set.
A new student moves into Mr. Gray’s class the next day.
Her name is Jan Li. Add her name to the class list.
7. In RED, add Jan Li’s name to the line plot and organized
list of data.
8. Find the mode with Jan Li.
9. Find the range with Jan Li.
10. Find the median with Jan Li.
5 6
Mode: 11 & 12
Range: 7-19 = 12
Median: 12
Mode: 11 & 12
Range: 5-19 = 14
Median: 12
Types of Data
Categorical or Numerical
Types of Data
•
•
•
•
•
•
•
•
•
In what month were you born?
What kind of pets do you have?
How many pets do you have?
Who is your favorite author?
How much time do you spend watching TV in a
day?
What’s your highest score in the game Yahtzee?
What color are your eyes?
How do you get to school?
How many DVD movies do you own?
Categorical Data
• Data that are words or categories.
• What month were you born?
• March= word
Numerical Data
• Data that are numbers.
• How many pets do you have?
• 2