One time Ms. Lawrenz went to Jewel-Osco and bought all the types of microwave popcorn they
had and conducted an experiment.
Scientific Question: Does the amount of butter on popcorn affect the number of kernels that pop?
1. Write a hypothesis in the proper format.
2. What is the independent variable?
3. What is the dependent variable?
4. What are the control variables?
Kelly thinks that a marble would roll faster if it is pushed down a longer slide. This leads to the
scientific question, what happens to the speed of a marble when the height of a ramp is changed?
1. Write a hypothesis in the proper format.
2. What is the independent variable?
3. What is the dependent variable?
4. What are the control variables?
Sponge Bob notices that his pals Gary and Mr. Krabbs are suffering from slimotosis, which
occurs when algae forms a thick mucus layer on their hands and feet. Patrick tells him that
rubbing seaweed on the hands and feet is the perfect cure, while Sandy says that drinking Dr.
Kelp will be a better cure. Sponge Bob decides to test this cure by rubbing Gary with seaweed
for 1 week and having Mr. Krabbs drink Dr. Kelp for 1 week. After a week of treatment, the
slime on Gary is gone!
1. What is the independent variable?
2. What is the dependent variable?
Two different kinds of roses are grown in a greenhouse for two months. The number of flowers
on each bush is counted at the end of an experiment.
1. What is the independent variable?
2. What is the dependent variable?
3. What are the control variables?