GHSGT Review
DATA ANALYSIS, PART 2
Pictographs
 A pictograph uses a small picture to represent a certain
number of participants
 Pick the number of how many to represent based on how
well it will divide into the totals
 Example: At a private school, there are 120 freshmen, 90 sophomores,
80 juniors, and 50 seniors. You would set each picture equal to 10
students because that divides nicely into all of the values.
Freshmen

Sophomores

Juniors

Seniors

 = 10 students
Bar Graphs
 A bar graph can be shown with either vertical bars, or
horizontal bars
 The bar graph is the best way to compare totals of two
Number of Cars Manufactured
items or categories
Example: You can see
that the Mazda plant
manufactured
approximately 1,100
more cars than the
Honda plant.
4500
4000
3500
3000
2500
2000
1500
1000
500
0
Honda
Volvo
Mazda
Ford
Line Graphs
 A line graph is the best way to compare two variables
 It is also a great way to show change over time (also called trends), or
whether a value is increasing or decreasing
Example:
Between
mileages 30,000
and 60,000
showed the
steepest decline
in the value of
Toni's car.
Value of Tony's Car vs. Mileage
$25,000
$20,000
$15,000
$10,000
$5,000
$0
Circle Graphs
 Also known as pie charts, circle graphs are a good
way to show parts of a whole, or percentages too
Example: You
can see in the
graph that the
Miller family
spends most of
its monthly
income on rent.
15% Miscellaneous
10% Utilities
10%
Transportation
30%
Groceries
35%
Rent
Venn Diagrams
 A Venn diagram shows how different groups are inter-
related
 Make sure you correctly interpret how to find the totals
from each of the parts
Example: The number of
people who had just pizza for
lunch was 30, then 15 people
had just a hamburger, but 10
people had both pizza and a
hamburger. So, 25
hamburgers were eaten
because 15 + 10 = 25.
Pizza
30
Hamburger
10
15
Sample Question 1
 Which kind of graph is best used to show how three




sets of a data are alike and different?
A. circle graph
B. bar graph
C. Venn diagram
D. line graph
Sample Question 2
 The results of a survey asking how many people lived




in a town over five years are shown in the chart.
Which type of graph should be used to show the
Population
results of the survey? Year
1
20,000
A. bar graph
2
25,000
B. circle graph
3
30,000
C. pictograph
4
32,000
D. line graph
5
35,000
Sample Question 3
 Which kind of graph is best used to show a percent of




share of a total?
A. circle graph
B. line graph
C. pictograph
D. bar graph
Sample Question 4
 The distribution of extra-credit points in Ms. Washington's




English class is shown on this graph. How many more
students received five extra-credit points than seven extracredit points?
Extra-Credit Points in English
A. 2
9
8
B. 3
7
C. 4
6
D. 5
5
4
3
2
1
0
3 points
4 points
5 points
6 points
7 points
Sample Question 5
Use the same distribution of extra-credit points. What
is the ratio of students receiving three points to
students receiving five points?
Extra-Credit Points in English
 A. 1:3
9
 B. 2:1
8
7
 C. 1:2
6
 D. 3:1
5
4
3
2
1
0
3 points
4 points
5 points
6 points
7 points
Solutions
 SQ1 – C
 SQ2 – A
 SQ3 – A
 SQ4 – A
 SQ5 - B