info on graphing your data
DESCRIPTION
Info on Graphing Your Data. Showing patterns & trends. A picture is worth a thousand words !. Basics of Graphing. Variables – what you measure in an experiment: Dependent variable measured variable - we don ’ t know how it will change until we do the experiment - PowerPoint PPT PresentationTRANSCRIPT
Showing patterns & trends
Info on Graphing Your Data
A picture is worth a
thousand words!
Basics of GraphingVariables – what you measure in an
experiment:
1. Dependent variablemeasured variable - we don’t know how it will change
until we do the experimentPlot it on the Y-axis (vertical axis) of the graph
2. Independent variable manipulated variable - it only changes because we
chose how it would changeX-axis (horizontal axis) of the graph
The effect of ___Independent___
on __Dependent__
Examples of Experiments
2005-2006
1. How does fertilizer affect the growth rate of plants?
we set up an experiment testing different amounts of fertilizer on different plants & measuring the growth (height) of the plants.
dependent variable (Y-axis)?o height of plants
independent variable (X-axis)?o amount of fertilizer
The effect of _____________
on _____________
Amount of Fertilizer
Height of Plants
Another Example Experiment
2005-2006
2. How does exercise affect the heart rate of 10th grade students?
we set up an experiment testing different lengths of time of exercise (minutes) on the heart rate of students: dependent variable (Y-axis)?
o heart rate independent variable (X-axis)?
o minutes of exercise
The effect of _____________
on _____________
Exercise
Heart Rate
Last Example!
2005-2006
3. What’s the favorite drink of students?
Set up an experiment surveying students and asking which is their favorite drink :
dependent variable (Y-axis)?o number of students choosing drink
independent variable (X-axis)?o type of drink
The effect of _____________
on _____________
Type of Drink
How many students chose it
Graphing the Data
2005-2006
Types of Graphs:1. line graphs
graphing data that shows continuous change
2. bar graphs (or histograms)graphing data that is in disconnected groups
2005-2006
The Effect of Temperature on Elevation
elevation
tem
pe
ratu
re
5
10
15
20
25
30
0 500 1000 1500 2000 25000
elevation (feet above sea level)
temp.
(°C)
0 30
500 25
1000 20
1500 15
2000 10
2500 5
1200 ft?
18
Line graph!
1200
Drink Preferences of Students
type of drink
nu
mb
er
of
stu
den
ts
1
2
3
4
5
6
Coke Pepsi water tea Gatorade0
drink number
Coke 1
Pepsi 1
Water 4
Iced tea 4
Gatorade 3
Bar graph!