Designing an Experiment

1
Designing an Experiment
2
Think of a Question
(1)

• What do you want to know?

• What is the effect of the____on the _____?
• Change the question into a Title statement
• The Effect of the _____________ on the
  _______________.

Independent Variable
Dependent Variable
3
Example What is the effect of a class on a
students stress level?
4
Make a Hypothesis
(2)

• A prediction of the experiments outcome

• If the __________________ changes then the
  _________________ will __________________.

independent variable
dependent variable
(guess??)
5
Design the Experiment

• What is your goal?
• What will you do to test your hypothesis?

6
Independent Variable (IV)
(3a)

• The one variable that the experimenter _______
  
• Each experiment should have only
• ____

changes
ONE

• Levels
• Various changes that will be made to the IV

7
Dependent Variable (DV)
(3b)

• The variable that changes due to the __
• This is the ___ that you measure

IV
data
8
Constants
(3c)

• Factors that stay the ____
• There are many in an experiment

same
9
Control
(3d)

• Used as a ________
• Unchanged/Natural
• Not present in all experiments.

comparison
10
Make Observations Record Data
(4)

• Two Types of Data
• _________
• Quantities,
• Numbers
• __________
• Qualities,
• Descriptions,
• Comparisons

Class Heart Rate
Math 72 bpm
English 86 bpm
History 74 bpm
Quantitative
Qualitative
Class Pulse Quality
Math Normal
English Strong
History Slightly Above Norm
11
Observations and Data

• Your data table should include the IV
  independent variable you are testing and the DV
  dependent variable or the data you are collecting.

12
Trials

• More trials
• More __________

reliable results
13
Study Results

• Data often shown as a ____so the experimenter
  can analyze the data.

graph
14
Sources of Error

• Things in an experiment that may affect the
  results

15
Conclusion
(5)

• 5 Sentences
• Purpose of the experiment
• Was Hypothesis supported or not
• How Data supports/does not support Hypothesis
• Sources of Error
• Conclusion you can draw