Name: _________________________
1. Mr. Krabbs wants to make Bikini Bottoms a nicer place to live. He has
created a new sauce that he thinks will reduce the amount of bodily gas that
comes out after eating krabby patties from the Krusty Krab. He brings in
100 customers that always have gas problems. He has 50 of them (Group A)
eat krabby patties with the new “Gas-free” sauce. The other 50 (Group B) eat krabby patties with sauce
that looks just like the Gas-free sauce but is really the old sauce with food coloring. Both groups were
told that they were getting Gas-free sauce. Two hours after eating the krabby patties, 30 customers in
Group A reported having fewer gas problems and 2 customers in Group B reported having fewer gas
problems.
What is the independent variable?
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How do you know?
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What is the dependent variable?
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How do you know?
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What is the control?
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How do you know?
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SpongeBob noticed that his favorite pants were not as clean as they used
to be. His friend Sandy told him that he should try using Clean-O
detergent, a new brand of laundry soap she found at Sail-Mart.
SpongeBob made sure to wash one pair of pants in plain water, for exactly
30 minutes, and another pair in water with the Clean-O detergent, for
exactly 30 minutes. After washing both pairs of pants a total of three times each, the pants washed in the CleanO detergent did not appear to be any cleaner than the pants washed in plain water.
What could SpongeBob’s hypothesis be? (Remember to use an “If.....then....” statement).
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What is a constant in this experiment?
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What is the control? __________________________________________________________________________________________
What is the independent variable? _________________________________________________________________________________________
What is the dependent variable?
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