AIM: How can we set up a controlled experiment
Do Now: Which of the following would be a correct
hypothesis for an experiment?
1. will plants grow tall with more sunlight?
2. If plants are exposed to more sunlight,
then they will grow taller
Using the hypothesis, identify the independent
variable and the dependent variable in this
experiment
Our Problem
How does our heart rate change
after exercise?
Our Observations
heart rate tends to increase after
we exercise.
Our Research
Library
Scientific Journals
Internet Sources
Our Hypothesis
If a person does 30 Jumping Jacks,
then his/her heart rate will
increase.
Our Controlled Experiment
We are going to design an experiment
that will allow us to measure heart
rate after we exercise.
In our Exercise
Experiment, which is the
independent variable and
which is the dependent
variable?
Independent Variable
What are we changing (manipulating)?
Jumping Jacks!!!!
Dependent Variable
What are we going to measure? What is
our data?
PULSE RATE!!!
In our Exercise Experiment, which is the
Control group and which is the experimental
group?
Control
no jumping jacks
Experimental
Jumping jacks
Constant
What should be the
same in all groups?
•
•
•
•
Age
Type of exercise
Time of day
Health
Sample size?
The number of “things”
included in group.
VS
***Remember- the bigger the sample
size, the more valid our results will
be!!
How many people should we use?
The whole class!!
Procedure
1)All students will measure their heart rate
for 1 minute during rest and record the
data.
2)Half the students will be instructed to
complete 30 Jumping Jacks. The other
half will rest.
3)All students will measure their heart
rate again for one minute and record it.
4)All students will calculate their change
in pulse rate.
5)We will record the class results
Results
• Data
• Graph
• table
Average change in pulse (bpm)
Resting
Exercise
Conclusion
Answer your problem by explaining
your data
Identify the Dependent and
Independent Variable:
1)In an experiment studying the effect
of sleep on student achievement.
2)In an experiment studying the effect
of caffeine on worker performance.
3)In an experiment studying plant
growth in different colors of light.
1.
2.
3.
4.
Problem
Research
Hypothesis
Experiment
–
–
–
–
–
Independent varialbe
Dependent variable
Control group
Experimental group
constant
5. Data- (***you will not have any data to use!!!)
–
–
What type of data would you collect?
how would you set up your data table or graph?