Worksheet titled "Simpsons use the Scientific Method" with two scenarios involving Smithers and Homer, asking students to identify controls, variables, and conclusions.

Let's solve each part of this worksheet step by step, using the scientific method and identifying the controls and variables in both scenarios.

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Scenario 1: Smithers' Experiment

> Situation: Smithers believes a special juice increases worker productivity. He creates two groups of 50 workers:
> - Group A: Given the special juice
> - Group B: Not given the juice
> Both groups staple papers for an hour.
> Results: Group A made 1,587 stacks; Group B made 2,113 stacks.

#### 1. Control Group
- The control group is the group that does not receive the experimental treatment.
- Answer: Group B (they did not get the special juice)

#### 2. Independent Variable
- This is the variable that the experimenter changes or manipulates.
- Here, Smithers is testing whether the special juice affects productivity.
- Answer: Whether or not the workers drink the special juice

#### 3. Dependent Variable
- This is the outcome being measured — what changes as a result of the independent variable.
- Here, it's how many stacks of papers were made.
- Answer: Number of stacks of papers stapled

#### 4. What should Smithers’ conclusion be?
- Group B (no juice) made more stacks than Group A (with juice).
- So, the juice did not increase productivity — in fact, it may have decreased it.
- Answer: The special juice does not increase productivity. Workers without the juice were more productive.

#### 5. How could this experiment be improved?
- Possible improvements:
- Random assignment of workers to groups
- Double-blind setup (workers don’t know who gets juice)
- Use a placebo (e.g., fake juice that looks like real juice)
- Repeat the experiment multiple times
- Ensure all workers are equally skilled or experienced
- Measure other factors (e.g., fatigue, motivation)
- Answer: The experiment could be improved by using a placebo, ensuring random selection, and repeating the test to confirm results.

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Scenario 2: Homer’s Experiment

> Situation: Homer notices green slime in his shower. Barney says coconut juice will remove it. Homer sprays:
> - One half with coconut juice
> - Other half with water
> After 3 days, no change on either side.

#### 6. What was the initial observation?
- Homer saw that his shower was covered in strange green slime.
- Answer: His shower was covered in a strange green slime.

#### 7. Control Group
- The control group is the one not receiving the treatment (or receiving a baseline treatment).
- Here, the half sprayed with water is the control (baseline condition).
- Answer: The half of the shower sprayed with water

#### 8. Independent Variable
- What Homer changed: What he sprayed on the shower.
- Two conditions: coconut juice vs. water.
- Answer: Type of liquid sprayed (coconut juice vs. water)

#### 9. Dependent Variable
- What was measured: Change in appearance of the green slime.
- Answer: Appearance/amount of green slime

#### 10. What should Homer’s conclusion be?
- There was no difference between the two sides after 3 days.
- So, coconut juice did not remove the slime better than water.
- Answer: Coconut juice does not effectively remove the green slime compared to water.

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✔ Final Answers Summary:

| Question | Answer |
|--------|--------|
| 1. Control Group | Group B |
| 2. Independent Variable | Whether or not workers drank the special juice |
| 3. Dependent Variable | Number of stacks of papers stapled |
| 4. Smithers’ Conclusion | The special juice does not increase productivity; workers without juice were more productive. |
| 5. Improve the Experiment | Use a placebo, random assignment, repeat trials, double-blind design |
| 6. Initial Observation | His shower was covered in green slime |
| 7. Control Group | Half of the shower sprayed with water |
| 8. Independent Variable | Type of liquid sprayed (coconut juice vs. water) |
| 9. Dependent Variable | Appearance/amount of green slime |
| 10. Homer’s Conclusion | Coconut juice does not remove the green slime better than water |

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This worksheet teaches students how to apply scientific thinking using real-life (even humorous!) examples. It emphasizes controlled experiments, variables, and logical conclusions based on evidence.