1. 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 50 customers (Group A) eat a breath mint after they finished eating a crabby patty. The other 50 customers (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, 30 customers in Group A and 10 customers in Group B reported having better breath than they normally had after eating crabby patties.
Which group of people were in the control group? Group without the secret ingredient, group B
What is the independent variable? The secret ingredient
What is the dependent variable? Fresh breath
What do you think Mr. Krabs’ conclusion should be? The secret ingredient helps people to have
fresh breath
Give examples/details that support why you think in #4 what Mr. Krabs’ conclusion should be.
30 out 50 people from group A had fresh breath but only 10 out 50 people from group B did
6. Why do you think 10 people in group B reported fresher breath?
People in group B thought they had the special mint; they don’t have bad breath as easily; they
didn’t eat as much

2. 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 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 that the pants washed in plain water.
7. What was the problem SpongeBob wanted to investigate? His pants are not as clean as they use to be.
What is the independent variable? Clean-O Detergent
What is the dependent variable? Cleanness of his pants.
What do you think SpongeBob’s conclusion should be? Whether using plain water or Clean-O
his pants are not getting any cleaner
Give examples/details that support why you think in #10 what SpongeBob’s conclusion should be?
After 3 washings with Clean-O detergent and/or plain water, the pants did not get any cleaner.

3. 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 jelly fish he saw in his front yard. He played his song for a total
of 3 times on the clarinet then repeated the experiment using a flute and then a guitar. He also
recorded the number of jellyfish he observed before he began playing an instrument. The results are
shown in the data table below.
Number of Jellyfish/Instrument
What is the independent variable? The clarinet
What is the dependent variable? The number of jellyfish
14. What do you think Squidward’s conclusion should be?
Music from both Clarinet and Guitar attract jellyfish
Trials
No Music
Clarinet
Flute
Guitar 1 5 15 12 2 3 10 8 18 9 7
Give examples/detail as to why you think in #14 what Squidward’s conclusion should be?
There was an average of 12 jellyfish that can when either the clarinet or guitar were played; where as with no music there was 3 jellyfish and the was 7 jellyfish with the flute.
Are the results reliable? Why or why not?
No, limited number of instruments, the number of trials, & the location .
Any suggestions of what Squidward could have done differently to gain better results?
Changed locations and tested to see if results are the same; increase number of instruments; increase number of trials

4. What did the Super Bubble ads claim?
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 5oz of Super Bubble Soap and 5oz of water, and the other was made with 5oz of regular bubble soap and 5oz of water. Patrick and SpongeBob used their favorite bubble wands to blow 10 different bubbles and did their best to measure the diameter of the bubbles as they popped on the table. The results are shown in the data table below.
Bubble
Super Bubble
Regular Soap 1 15 10 2 5 3 12 16 4 18 14 22 11 6 13 7 8 9
What did the Super Bubble ads claim?
Super Bubble bubbles will be twice as big as regular bubble solutions.
What is the independent variable? Super Bubble
20. What is the dependent variable? Diameter of bubbles
21. Look at the results in the data table.
Calculate the average diameter for each bubble solution.
Super Bubble = __15.1__ cm
Regular Soap = __11.5__ cm
What do you think SpongeBob’s and Patrick’s conclusion should be?
Results show bubbles from Super Bubble are larger but not twice as large
22. Are the results reliable? Why or why not? No, bubble sizes are not consistent.

5. The Krusty Scenario
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.
1. Identify the Control Group: Test subject A
1a. Experi. Group: Test subject B
2. Identify the Independent Variable: Type of itch powder
3. Identify the Dependent Variable: Length of time having itches
4. Explain whether the data supports the advertisements claims about its product.
The data does support the claim, but only 2 tests subjects is not sufficient.

6. Bart believes that mice exposed to microwaves will become extra strong (maybe), He's
been reading too much Radioactive Man. He decides to perform this experiment by placing
10 mice in a microwave for 10 seconds. 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 microwaved mice were able to push the block away. 7 out of 10 of the
non-microwaved mice were able to do the same.
1. Identify the Control Group: 10 mice not placed in the microwave/not exposed to microwaves
1a. Exper. Group: 10 mice placed in the microwave/exposed to microwaves
2. Identify the Independent Variable: Use of microwave or not (exposure to microwaves)
3. Identify the Dependent Variable: Number of mice that moved the block of wood
4. What should Bart's conclusion be?
More trails are needed. It is not known whether or not microwaves give mice extra strength; there is not enough significant data.
5. How could Bart's experiment be improved? Use another source of energy,

7. The Lisa Scenario
Lisa is working on a science project. Her task is to answer the question: "Does Rogooti (which is a commercial hair product) affect the speed of hair growth"? Her family is willing to volunteer for the experiment. Describe how Lisa would perform this experiment.
Identify the:
1. Control Group: The group not using the Rogooti
2. Experi. Group: The group using the Rogooti
3. Independent Variable: The type of hair product used
4. Dependent Variable: The speed of hair growth
6. Describe how Lisa would perform this experiment (What is the experimental procedure?).
One group using the product
One group not using the product
How often the product is used
How long the treatment (the product) is used

8. 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.
Identify the:
1. Control Group: Group B
2. Independent Variable: volume of special juice
3. Dependent Variable: number of stapled packs of paper
4. What should Smithers‘ conclusion be?
The special juice interferes with the workers productivity since Group A stapled fewer
packets than group B.
5. How could this experiment be improved?
Vary the volume of juice given, increase the sample size, take more time points, conduct the experiment for a longer period of time.