Transcript Cut Cylinder

Graphs and Charts
Technology
Department
Graphic Communication
Coatbridge High School
Graphs
A GRAPH (or Line Graph) connects a
series of plotted points. The graph
depicts trends or movement over a
period of time.
Line Graph
WHEN TO USE:
To show trends or movements rather than
amounts
To Illustrate long series of data
To compare series of data
To predict trends or movement
30
Marks
25
20
15
10
5
0
Andrew James
David
Names
Alan
WHEN NOT TO USE:
When the emphasis is on amounts
When relative size or difference is required
Enhancing Graphs
No. of people who chose sweet
Month
Votes
Jaguar
Aston Martin
BMW
Dodge
10
8
6
4
2
0
MG
Favourite Cars
12
2
3
3
Starburst
Rolo
Marsbar
Polo
4
Fruit Pastils
Smarties
l
s
Skittles
12
10
8
9
6 7
4
2
0
N
u7
m
b6
e 5
r
4
o
3
f
2
P
u 1
p
i 0
Lotus
This is a
line graph
showing the
birthday months
of 50 Robert
Gordon's College
pupils.
BAR CHARTS
A BAR CHART compares qualities or
values which are not time related.
Physical qualities such as size or weight
work best vertically.
Bar Chart
Alan
David
Comparison of the magnitude of a
number of items work best horizontally.
Names
James
Andrew
0
10
20
Marks
30
WHEN TO USE:
To compare the magnitude or size.
WHEN NOT TO USE:
To illustrate trends or movement
Enhancing Bar Charts
0
5
10
15
20
25
PIE CHARTS
Pie Chart
A PIE CHART is used to show relative
values as a whole
Charts with 7 or more components are
usually confusing and difficult to interpret
WHEN TO USE:
To show approximate relative values of
component parts of a whole.
WHEN NOT TO USE:
To compare component parts
To show large numbers of components in
a part.
When the values of a number of
component parts are small
Enhancing Pie Charts
F avourite Sport
Swimming
Football
Rugby
Hockey
Athletics
Cricket
PICTOGRAM
Pictograms may be considered a type of
BAR graph
Values or sizes are represented by
symbols or pictures directly related to the
information being conveyed.
20
16
Number
for favourite 12
drink
WHEN TO USE:
8
4
0
Coke
Drink type
When items by be represented by
symbols or pictures.
WHEN NOT TO USE:
When symbols or pictures are unclear or
obscure.
Enhancing Pictograms