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# experimental design

### Experimental Design

TERMDEFINITION
CONSTANTS variables in an experiment that are kept the same in an experiment. There are many of these in an experiment.
HYPOTHESIS A prediction about the outcome of the experiment
INDEPENDENT VARIABLE the factor that is changed on purpose by the experimenter; there can only be one of these in an experiment.
CONTROL The level of the independent variable chosen as the standard of comparison; may represent the “normal condition”.
PROBLEM QUESTION A statement describing an experiment usually written as “What is the Effect of ……. On the ………….
INDEPENDENT VARIABLE LEVELS The changes that are made to the independent variable. These are the conditions being tested.
REPEATED TRIALS The number of times the experiment is done for each level of the independent variable.
DEPENDENT VARIABLE is the factor that will change because of the independent variable; the factors that you measure or observe as data
Identify the IV and DV for the following problem:Does a person’s weight give them an advantage when wrestling? IV: weight DV: advantage when wrestling
Write a hypothesis for the following problem: How does the height of a basketball net effect the number of shots scored? YOUR HYPOTHESIS MAY LOOK SOMETHING LIKE: *If the height of the backboard is taller than the standard then the number of shots will be less than when using standard.
Explain the importance of having constants (controlled variables) when testing a hypothesis. Other variables can effect the results of the experiment. By keeping them constant, it becomes more likely that the DV is only effected by the IV and not any other factors.
If the problem is: How does the height of the basketball net effect the number of shots scored? Name some constants. * type of ball *distance from net *person throwing ball *setting (inside vs. outside court)
If the problem is: How does the height of the basketball net effect the number of shots scored? Name at least 3 variable levels that should be tested and identify the control. YOUR ANSWERS MAY VARY: I suggest 5 feet, 10 feet, 15 feet and 20 feet. 10 feet is the control because it is the official standard of NBA.
If the problem is: How does the height of the basketball net effect the number of shots scored? How many times should you do this experiment? Why? Test it at least 3 times (I would suggest a minimum of 10). The more times you test a hypothesis, the more reliable your results.
If the problem is: How does the height of the basketball net effect the number of shots scored? What is the IV and DV? IV: height of basketball net DV: number of shots scored
If the problem is: Is the height of a plant effected by the amount of salt in water? What is the IV and DV? IV: amount of salt in water DV: height of plant
If the problem is: How does the amount of carbon dioxide in the atmosphere effect the degree of global warming? What is the IV and DV? IV: amount of carbon dioxide in atmosphere DV: degree of global warming
If the problem is: Is the height of a plant effected by the amount of salt in water? Identify the constants. *type of plant *amount of water *amount of sunlight *type of soil
If the problem is: Is the height of a plant effected by the amount of salt in water? Write a hypothesis for this (if...then...) YOUR HYPOTHESIS MAY LOOK LIKE THIS: If the amount of salt in the water is 5% or greater then the height of the plant will be at least 10% shorter than the control.
Created by: jsolari