Worksheet on the scientific method focusing on controls and variables through two scenarios involving SpongeBob and his friends.

Let’s go through each question step by step.

---

Experiment 1: Patty Power

Mr. Krabs is testing a new sauce to reduce gas from eating crabby patties.

- He has 100 customers total.
- Group A (50 people) gets the new sauce.
- Group B (50 people) gets a fake sauce that looks like the new one but is just mayo + food coloring.
- Both groups think they’re getting the real gas-reducing sauce.
- After 2 hours:
- 30 in Group A say they have fewer gas problems.
- 8 in Group B say they have fewer gas problems.

Now let’s answer the questions:

Q1: Which people are in the control group?
→ The control group is the one that does NOT get the actual treatment being tested. Here, Group B got the fake sauce — so they are the control group. They help us see what happens without the real sauce.

Q2: What is the independent variable?
→ This is what Mr. Krabs changed on purpose. He changed the type of sauce given to each group. So the independent variable is: the type of sauce (new sauce vs. fake sauce).

Q3: What is the dependent variable?
→ This is what he measured — the outcome. He measured how many people reported having fewer gas problems. So the dependent variable is: number of customers reporting fewer gas problems.

Q4: What should Mr. Krabs’ conclusion be?
→ Group A (real sauce) had 30 people feel better. Group B (fake sauce) had only 8. That means the new sauce seems to work better than the fake one. But we also see that some people in Group B felt better — maybe because they thought they were getting the real thing (placebo effect). Still, since more people in Group A felt better, the conclusion should be: The new sauce appears to reduce gas problems more than the fake sauce.

Q5: Why do you think 8 people in group B reported feeling better?
→ Even though they got the fake sauce, they believed they were getting the real gas-reducing sauce. Sometimes, just believing something will help can make you feel better — this is called the “placebo effect.” So their minds tricked them into thinking they felt better.

---

Experiment 2: Slimotosis

SpongeBob sees Gary has slimotosis (slimy shell + bad smell).

Patrick says: rub seaweed on shell → cures it.
Sandy says: drink Dr. Kelp → cures it.
SpongeBob tries BOTH at the same time: rubs seaweed AND gives Dr. Kelp for 1 week.
Result: slime gone, shell smells better.

Now answer the questions:

Q1: What was the initial observation?
→ SpongeBob noticed that Gary’s shell had nasty slime and smelled horrible. That’s the starting point — the problem he wanted to fix.

Q2: What is the independent variable?
→ The independent variable is what SpongeBob changed or tested. But here’s the problem: he tested TWO things at once — seaweed AND Dr. Kelp. So technically, there are two independent variables: rubbing seaweed on the shell and drinking Dr. Kelp. But since he didn’t test them separately, we can’t tell which one worked.

Q3: What is the dependent variable?
→ This is what he measured — whether the slime went away and if the shell smelled better. So: whether Gary’s slimotosis improved (slime gone, smell better).

Q4: What should SpongeBob’s conclusion be?
→ He can’t say for sure which cure worked because he used both at the same time. Maybe seaweed worked. Maybe Dr. Kelp worked. Maybe both together worked. To know for sure, he’d need to test them one at a time. So his conclusion should be: Gary got better, but I don’t know which cure worked — I need to test them separately next time.

---

Final Answer:

Patty Power:
- Control group: Group B (those who got the fake sauce)
- Independent variable: Type of sauce (new sauce vs. fake sauce)
- Dependent variable: Number of customers reporting fewer gas problems
- Conclusion: The new sauce seems to reduce gas more than the fake sauce.
- Why 8 in Group B felt better: Placebo effect — they believed they got the real sauce.

Slimotosis:
- Initial observation: Gary’s shell had nasty slime and a horrible odor.
- Independent variable: Rubbing seaweed on the shell AND drinking Dr. Kelp (but tested together, so unclear which caused improvement)
- Dependent variable: Whether Gary’s slimotosis improved (slime gone, smell better)
- Conclusion: Gary got better, but SpongeBob can’t tell which cure worked — he needs to test them separately.