The Scientific Method: To help you understand the HOMER SIMPSON WORKSHEET, remember
the following things:
1) Hypothesis: Your “IF-Then” statement.
2) Independent Variable: This is the variable that the scientist controls or changes –
WHAT THE SCIENTIST DOES. Ask yourself, “What are you (the scientist) doing or
changing in this experiment?”
3) Dependent Variable: This is the variable that is RESPONDING to what the scientist did
(the independent variable). Ask yourself, “What are you trying to record or measure?”
This is the “THEN” in the if-then statement
4) Control Group – This is the group that we use to compare our experimental group
with. It is the group we DO NOTHING TO. We might use a placebo (fake drug,
substance, or material) as the control group.
5) Experimental Group – This is the group that we do the experiment on.
EXAMPLE: Spongebob Squarepants decided that he wanted to make Bikini-Bottom
beautiful with new plants. He felt that if he gave these plants fertilizer, they would grow
nice and tall. For Group A, Spongebob gave the plants Supergro Fertilizer. However, He
did not give Group B any fertilizer. At the end of the month, Spongebob noticed that the
plants given Supergro Fertilizer grew an extra 20 cm.
Hypothesis: “If I give plants fertilizer, then they will increase in growth.”
Independent Variable: Amount of fertilizer
Dependent Variable: plant growth
Control Group: Group with NO Fertilizer (Group B)
Experimental Group: Group GIVEN fertilizer (Group A)
Conclusion: Spongebob was correct. If you add Supergro Fertilizer, the plants will grow