6
5
4
3
2
1
0
Series 1
Series 2
Series 3
Day 1
Day 2
Day 3
Day 4
INTRODUCTION
• Graphing is an important procedure used by
scientists to display the data that is collected
during a controlled experiment.
• Line graphs must be constructed correctly to
accurately portray the data collected.
• Many times the wrong construction of a graph
detracts from the acceptance of an individuals
hypothesis.
For example……..
AA Batteries Tested in a Flashlight
Energizer Brand AA Batteries
Battery #
Time (hour)
#3
#4
#19
#20
#31
#32
Voltage Voltage Flashlight Voltage Voltage Flashlight Voltage Voltage Flashlight Average
dead?
dead?
dead? Voltage
0.0 1.605 1.610
1.607 1.609
1.604 1.605
1.607
0.5
1.396 1.402
1.400 1.412
1.403
1.0 1.356 1.363
1.343 1.351
1.354 1.360
1.355
1.5
1.307 1.314
1.318 1.327
1.317
2.0 1.295 1.295
1.280 1.288
1.304 1.311
1.296
2.5 1.273 1.280
1.267 1.284
1.268 1.278
1.275
3.0 1.260 1.265
1.255 1.262
1.261 1.267
1.262
3.5 1.249 1.256
1.245 1.247
1.247 1.252
1.249
4.0
1.226 1.232
1.230 1.238
1.232
4.5 1.221 1.226
1.206 1.216
1.212 1.224
1.218
5.0
1.197 1.204
1.196 1.210
1.202
5.5 1.160 1.186
1.170 1.178
1.177 1.190
1.177
6.0
1.128 1.150
1.174 1.184
1.159
6.5 1.108 1.135
1.085 1.117
1.132 1.144
1.120
7.0 0.630 1.120 Yes
1.012 1.063
1.125 1.137
1.015
7.5
0.515 0.586 Yes
1.063 1.095
0.815
8.0
0.609 0.900 Yes
0.755
Now Let’s look at the Graph…..
A GRAPH CONTAINS FIVE MAJOR PARTS:
1. The title,
2. The independent
variable,
3. The dependent
variable,
4. The scales for
each variable,
5. The legend.
TIME (THE INDEPENDENT VARIABLE) IS ON THE X-AXIS OF THE GRAPH.
VOLTAGE (THE DEPENDENT VARIABLE) IS ON THE Y-AXIS OF THE GRAPH.
NOW IT IS YOUR TURN…………
Procedure:
Using the following data, answer the questions below and then construct a line
graph.
Depth in
meters
2
5
10
16
25
30
Number of Bubbles / minute Number of Bubbles / minute
Plant A
Plant B
29
21
36
27
45
40
32
50
20
34
10
20
1.
2.
3.
4.
5.
What title would you give the graph?
What is the independent variable?
Why?
What is the dependent variable?
Why?
Title of Graph
Dependent Variable
60
50
40
Plant A
Plant B
30
20
10
0
2
5
10
16
Independent Variable
25
30