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# experimental design

### Experimental Design--vocab and practice problems

variables in an experiment that are kept the same in an experiment. There are many of these in an experiment. CONSTANTS
A prediction about the outcome of the experiment HYPOTHESIS
the factor that is changed on purpose by the experimenter; there can only be one of these in an experiment. INDEPENDENT VARIABLE
The level of the independent variable chosen as the standard of comparison; may represent the “normal condition”. CONTROL
A statement describing an experiment usually written as “What is the Effect of ……. On the ………….?" PROBLEM QUESTION
The changes that are made to the independent variable. INDEPENDENT VARIABLE LEVELS
The number of times the experiment is done for each level of the independent variable. REPEATED TRIALS
is the factor that responds or reacts to the independent variable; the factors that you measure or observe as data DEPENDENT VARIABLE
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 affect 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.
You notice your cat is very playful on days when it's sunny & warm, but less playful and often not in the mood to play when the day is dark and drizzly. You begin to wonder if the weather can impact a cat's mood. Write a problem question to investigate. Examples: How does the weather affect my cat's mood?, Is my cat's mood affected by the weather?, What is the relationship between my cat's mood and the day's weather?, Can the weather affect my cat's mood?
When you get an iced coffee from Dunkies (w/ extra sugar), there a pool of sugar is at the bottom of the cup. You don't like this and want to find out how you can make an iced coffee w/ extra sugar that completely dissolves. What is the DV? the amount of sugar that gets dissolved
Created by: jsolari