Name: ________________________
Testable Questions, Hypothesis, Variables, Controls, Oh My!
Use your own words to define:
Testable question:
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Manipulated/Independent variable:
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Responding/Dependent variable
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Controlled variable:
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Hypothesis::
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What is the relationship between the different variables, the controls and the hypothesis:
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Practice
Circle the questions which are testable using scientific experimentation.
1. Are there more seeds in Fuji Apples or Washington Apples?
2. What types of apples grow in Missouri?
3. How does talking to a plant affect a plant’s height?
4. What happens if you do not eat breakfast?
5. Which planet is the most interesting one to study?
6. Which objects are attracted by a magnet: paperclip, penny, foil?
7. Will larger or smaller seeds germinate faster?
8. Do larger or smaller seeds make prettier flowers?
9. Do flying saucers really exist?
10. Which pill design – tablet, caplet, or capsule – will dissolve faster?
11. Why does doing homework help your grades?
12. How does the size of a helicopter’s blade length affect the speed and number of rotations?
13. Does the temperature of a classroom affect student performance?
14. How does talking to a plant affect the plant?
Change 2 of the NON-testable questions to TESTABLE questions in the space.
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Identifying variables and correcting hypothesis practice. Use what you learned to identify the
variables and correct the following hypotheses.
Example: If you spend more time studying, then your grade will improve.
Manipulated variable:
Time spent studying____________________________________________________________
Responding variable:
Grade________________________________________________________________________
Corrected hypothesis:
If studying improves grades and you spend more time studying, then your grade will
improve.___
If the temperature of the room is increased, then the bacteria will grow faster.
Manipulated variable:
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Responding variable:
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Corrected hypothesis:
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If people see funny commercials, then they are more likely to purchase a product.
Manipulated variable:
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Responding variable:
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Corrected hypothesis:
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If you spend a lot of time in the sun, then you will increase your risk of skin cancer.
Manipulated variable:
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Responding variable:
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Corrected hypothesis:
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Name: ________________________________
Identify the controls, variables and write a hypothesis - Adapted from http://goo.gl/BkhCN1
Smithers thinks that a special juice will increase the productivity of workers. He creates two
groups of 50 workers each and assigns each group the same task (in this case, they're supposed
to staple a set of papers). Group A is given the special juice to drink while they work. Group B is
not given the special juice. After an hour, Smithers counts how many stacks of papers each group
has made. Group A made 1,587 stacks, Group B made 2,113 stacks.
Manipulated variable:
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Responding variable:
________________________________________________________________________________
Controls:
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What was Smither’s hypothesis?
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Homer notices that his shower is covered in a strange green slime. His friend Barney tells
him that coconut juice will get rid of the green slime. Homer decides to check this this out
by spraying half of the shower with coconut juice. He sprays the other half of the shower
with water. After 3 days of "treatment" there is no change in the appearance of the green
slime on either side of the shower.
Manipulated variable:
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Responding variable:
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Controls / Control Group:
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What was Homer’s hypothesis?
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________
Krusty was told that a certain itching powder was the newest best thing on the market, it even claims to cause
50% longer lasting itches. Interested in this product, he buys the itching powder and compares it to his usual
product. One test subject (A) is sprinkled with the original itching powder, and another test subject (B) was
sprinkled with the Experimental itching powder. Subject A reported having itches for 30 minutes. Subject B
reported to have itches for 45 minutes.
Manipulated variable:
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Responding variable:
________________________________________________________________________________
Controls / Control Group:
________________________________________________________________________________
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What was Krusty’s hypothesis?
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__________
Bart believes that mice exposed to radiowaves will become extra strong (maybe he's been
reading too much Radioactive Man). He decides to perform this experiment by placing 10 mice
near a radio for 5 hours. He compared these 10 mice to another 10 mice that had not been
exposed. His test consisted of a heavy block of wood that blocked the mouse food. He found
that 8 out of 10 of the radiowaved mice were able to push the block away. 7 out of 10 of the
other mice were able to do the same.
Manipulated variable:
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Responding variable:
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Controls / Control Group:
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What was Krusty’s hypothesis?
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