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SpongeBob Experiments
Copy and fill in the blanks. (Black text)
(Copy and complete all the lettered items. Blue items or questions will help you. Copy the words and fill in the blanks.)

Experimental design terms to help you:
Controlled variable- variables that are kept the same
Independent or manipulated variable: the factor the experimenter changes/ most experiments should only have one
Dependent or responding variable: is the factor that is measured or observed to change/ the change depends on the independent variable
Control subjects or group- are used as a comparison and are not experimented on

Flower Power
SpongeBob loves to garden and wants to grow lots of pink flowers for his pal Sandy. He bought a
special Flower Power fertilizer to see if will help plants produce more flowers. He plants two plants of
the same size in separate containers with the same amount of potting soil. He places one plant in a sunny
window and waters it every day with fertilized water. He places the other plant on a shelf in a closet and

waters it with plain water every other day.

1A. The manipulate variable is...
1B. The responding variable is...
(Write a hypothesis for this experiment.)
1C. Hypothesis: .........................
1D. Variables kept the same are...
1E. The plant getting plain water is the…
(What variables were not kept the same/controlled?)
1F. The variables not controlled are…
(Think about how to fix the experiment.)

Super Snails
Gary is not the smartest snail in Bikini Bottom and believes he can improve his brain power by
eating Super Snail Snacks. In order to test this hypothesis, he recruits SpongeBob and several snail
friends to help him with the experiment. The snails ate one snack with each meal every day for three
weeks. SpongeBob created a test and gave it to the snails before they started eating the snacks as well as
after three weeks.
2A. The manipulate variable is...
2B. The responding variable is...
2C. Hypothesis: .........................
(How could this experiment be improved? How could a comparison be included in the experiment?)
2D. Add a control snail that gets ....... snacks.
(Does the data support the hypothesis/ do the Super Snail Snacks work?)
2E. Most of the snails showed ………… , so the snacks …………….. work.
2F. Results produced by beliefs or expectations are called the placebo effect.
(Do you think Gary's improved score was due to the placebo effect?)

Bubble Time
Patrick loves bubble gum and would like to be able to blow bigger bubbles than anyone else in
Bikini Bottom. To prepare for the Bikini Bottom Big Bubble Contest, he bought five different brands of
bubble gum and needs your help to find the brand that creates the biggest bubbles. Write an experiment
to test the bubble power of the bubble gum brands and help Patrick win the contest.
3A. The manipulate variable is...
3B. The responding variable is...
3C. Hypothesis: .........................
3D. The …. are compared, so they act kind of like controls.
3E. Write an experiment to test which brand produces the biggest bubble.

Patty Power
Mr. Krabbs wants to make Bikini Bottoms a nicer place to live. He has created a new sauce
that he thinks will reduce the production of body gas associated with eating crabby patties
from the Krusty Krab. He recruits 100 customers with a history of gas problems. He has 50 of
them (Group A) eat crabby patties with the new sauce. The other 50 (Group B) eat crabby
patties with sauce that looks just like new sauce but is really just mixture of mayonnaise and
food coloring. Both groups were told that they were getting the sauce that would reduce gas
production. Two hours after eating the crabby patties, 30 customers in group A reported
having fewer gas problems and 8 customers in group B reported having fewer gas problems.
4A. The manipulate variable is...
4B. The responding variable is...
4C. Hypothesis: .........................
4D. Mr. Krabs’ should conclude that...
4E. Probably, 8 people in group B reported less gas due to the…

Sponge Bob notices that his pal Gary is suffering from slimotosis, which occurs when the shell
develops a nasty slime and gives off a horrible odor. His friend Patrick tells him that rubbing seaweed
on the shell 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 him drink Dr. Kelp.
After a week of treatment, the slime is gone and Gary’s shell smells better.

5A. The manipulate variable is...
5B. The responding variable is...
5C. Group ….. is the control.
(What should SpongeBob conclude?)
5D. Conclusion: .......................
(What is wrong with this experiment?)
5E. Experiment was not designed to handle...
(How could this experiment be done correctly?)
Find four snails with slimtosis.
*Rub one with kelp.
*Have another snail drink Dr. Kelp.
*Rub the third snail with kelp and have it drink Dr. Kelp.
*Use the fourth snail as a control giving it no treatment.

Microwave Miracle
Patrick believes that fish that eat food exposed to microwaves will become smarter and would be
able to swim through a maze faster. He decides to perform an experiment by placing fish food in
a microwave for 20 seconds. He has the fish swim through a maze and records the time it
takes for each one to make it to the end. He feeds the special food to 10 fish and gives regular food
to 10 others. After 1 week, he has the fish swim through the maze again and records the times for each.

6A. The manipulate variable is...
6B. The responding variable is...
6C. Hypothesis: .........................
6D. The fish getting regular food are the…

6E. Patrick should conclude that...
Look at the results in the charts. What should Patrick’s conclusion be?
Subtract the before and after times for each fish and put the answers in a table. Calculate the average improvement for each group. Look at fish 2 in the experimental group. Change the improvement of fish 2 to 4 seconds and recalculate the average for the special food group. Does most of the difference come from fish 2? If so, how does this affect the validity of the experiment?
(With a 60 second differences between individual fish, the 2.4 second differences between the fish groups is not significant.)

Squidward’s Symphony
Squidward loves playing his clarinet and believes it attracts more jellyfish than any other instrument he
has played. In order to test his hypothesis, Squidward played a song on his clarinet for a total of 5
minutes and counted the number of jellyfish he saw in his front yard. He played the song a total of
3 times on his clarinet and repeated the experiment using a flute and a guitar. He also recorded the
number of jellyfish he observed when he was not playing an instrument. The results are shown in the chart.
7A. The manipulate variable is...
7B. The responding variable is...
7C. Hypothesis: .........................
(How does music vs. no music affect the number of jellyfish?)
7D. More jelly fish are present ...... music than ...... music.
(How does the clarinet vs. the guitar affect the number of jellyfish?)
7E. The hypothesis was not supported because...

Super Bubbles
Patrick and SpongeBob love to blow bubbles! Patrick found some Super Bubble Soap at Sail-Mart. The ads claim that Super Bubble Soap will
produce bubbles that are twice as big as bubbles made with regular bubble soap. Patrick and SpongeBob made up two samples of bubble solution.
One sample was made with 5 oz. of Super Bubble Soap and 5 oz. of water, while the other was made with the same amount of water and 5 oz. of
regular bubble soap. Patrick and SpongeBob used their favorite bubble wands to blow 10 different bubbles and did their best to measure the
diameter of each one. The results are shown in the chart

8A. The manipulate variable is...
8B. The responding variable is...
8C. Hypothesis: .........................
8D. The regular soap mix is the...
Calculate the average diameter for each bubble solution.
Super Bubble = 15.1 cm / Regular Soap = 11.5 cm
How would it affect the results if Patrick used the super mix and SpongeBob used the regular mix.
What if Patrick is a better bubble blower? What if Patrick is a worse bubble blower?
8E. Conclusion: If both Patrick and SpongeBob blew 5 bubbles with each mix, then the hypothesis is ...... because.......

Krusty Krabs Breath Mints
Mr. Krabs created a secret ingredient for a breath mint that he thinks will “cure” the bad breath people
get from eating crabby patties at the Krusty Krab. He asked 100 customers with a history of bad breath
to try his new breath mint. He had fifty customers (Group A) eat a breath mint after they finished
eating a crabby patty. The other fifty (Group B) also received a breath mint after they finished the
sandwich, however, it was just a regular breath mint and did not have the secret ingredient. Both
groups were told that they were getting the breath mint that would cure their bad breath. Two hours
after eating the crabby patties, thirty customers in Group A and ten customers in Group B reported
having better breath than they normally had after eating crabby patties.

9A. The manipulate variable is...
9B. The responding variable is...
9C. Hypothesis: .........................
9D. Group B was the...
9E. (What should be Krabs' conclusion?)
9F. Ten group B people reported better breath because of...

SpongeBob Clean Pants
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 and another pair in water with the
Clean-O detergent. After washing both pairs of pants a total of three times, the pants washed in the
Clean-O detergent did not appear to be any cleaner than the pants washed in plain water.
10A. The manipulate variable is...
10B. The responding variable is...
10C. Hypothesis: .........................
10D.The control is...
10E. Conclusion: ........................

Marshmallow Muscles
Larry was told that a certain muscle cream was the newest best thing on the market and claims to
double a person’s muscle power when used as part of a muscle-building workout. Interested in this
product, he buys the special muscle cream and recruits Patrick and SpongeBob to help him with an
experiment. Larry develops a special marshmallow weight-lifting program for Patrick and SpongeBob.
He meets with them once every day for a period of 2 weeks and keeps track of their results. Before
each session Patrick’s arms and back are lathered in the muscle cream, while Sponge Bob’s arms and
back are lathered with the regular lotion.

11A. The manipulate variable is...
11B. The responding variable is...
11C. Hypothesis: .........................
11D. The control in this experiment is…
11E. Conclusion:
(What should Larry’s conclusion be?)

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