simpsons - identify the controls and variables
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, theyre 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.
1. control group
2. independent variable
3. dependent variable
4. what should smithers conclusion be?
5. how could this experiment be improved?
homer notices that his shower is covered in a strange green slime. his friend barney tells him that coconut juice will get rid of the green slime. homer decides to check this out by spraying half of the shower with coconut juice. he sprays the other half of the shower with water. after 3 days of reatment\ there is no change in the appearance of the green slime on either side of the shower.
6. what was the initial observation?
7. control group
8. independent variable
9. dependent variable
10. what should homers conclusion be?
bart believes that mice exposed to microwaves will become extra strong (maybe hes 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.
11. control group
12. independent variable
13. dependent variable
14. what should barts conclusion be?
15. how could barts experiment be improved?
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.
16. control group
17. independent variable
18. dependent variable
19. explain whether the data supports the advertisements claims about its product.
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.
20. describe how lisa would perform this experiment.
identify the
a. control group
b. independent variable
c. dependent variable
d. controlled variables

Question

simpsons - identify the controls and variables
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, theyre 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.
1. control group
2. independent variable
3. dependent variable
4. what should smithers conclusion be?
5. how could this experiment be improved?
homer notices that his shower is covered in a strange green slime. his friend barney tells him that coconut juice will get rid of the green slime. homer decides to check this out by spraying half of the shower with coconut juice. he sprays the other half of the shower with water. after 3 days of 	reatment\ there is no change in the appearance of the green slime on either side of the shower.
6. what was the initial observation?
7. control group
8. independent variable
9. dependent variable
10. what should homers conclusion be?
bart believes that mice exposed to microwaves will become extra strong (maybe hes 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.
11. control group
12. independent variable
13. dependent variable
14. what should barts conclusion be?
15. how could barts experiment be improved?
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.
16. control group
17. independent variable
18. dependent variable
19. explain whether the data supports the advertisements claims about its product.
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.
20. describe how lisa would perform this experiment.
identify the
a. control group
b. independent variable
c. dependent variable
d. controlled variables

Accepted Answer

### 1. Smithers' Experiment
#### 1. Control Group
# Brief Explanations:
The group not given the special juice (Group B) is the control, as it’s the baseline for comparison.
# Answer:
Group B (workers not given the special juice)

#### 2. Independent Variable
# Brief Explanations:
The independent variable is what’s manipulated: the special juice (given or not).
# Answer:
Special juice (administration of the juice)

#### 3. Dependent Variable
# Brief Explanations:
The dependent variable is what’s measured: productivity (stacks of papers stapled).
# Answer:
Productivity (number of stacks of papers stapled)

#### 4. Smithers’ Conclusion
# Brief Explanations:
Group B (no juice) had more stacks (2,113 vs. 1,587), so the juice *decreased* productivity.
# Answer:
The special juice does not increase worker productivity; in fact, it may decrease it (since Group B made more stacks).

#### 5. Experiment Improvement
# Brief Explanations:
Repeat the experiment with more trials or groups to reduce chance and test consistency.
# Answer:
Repeat the experiment with more groups of workers or over multiple time periods to confirm results.

#### 6. Initial Observation
# Brief Explanations:
Smithers’ initial thought: a special juice might increase worker productivity.
# Answer:
Smithers thinks a special juice will increase workers’ productivity.

### 2. Homer’s Experiment
#### 7. Control Group
# Brief Explanations:
The half of the shower sprayed with water (not coconut juice) is the control.
# Answer:
The half of the shower sprayed with water

#### 8. Independent Variable
# Brief Explanations:
The independent variable is the treatment: coconut juice (vs. water).
# Answer:
Coconut juice (sprayed on half the shower)

#### 9. Dependent Variable
# Brief Explanations:
The dependent variable is the change in green slime appearance.
# Answer:
Change in the appearance of green slime

#### 10. Homer’s Conclusion
# Brief Explanations:
After 3 days, no change in slime on either side, so coconut juice had no effect.
# Answer:
Coconut juice does not remove green slime (no difference between treated and control sides).

### 3. Bart’s Experiment
#### 11. Control Group
# Brief Explanations:
The 10 mice not exposed to microwaves are the control.
# Answer:
The 10 mice not exposed to microwaves

#### 12. Independent Variable
# Brief Explanations:
The independent variable is microwave exposure (yes/no).
# Answer:
Microwave exposure (placing mice in a microwave for 10 seconds)

#### 13. Dependent Variable
# Brief Explanations:
The dependent variable is mouse strength (ability to push the block).
# Answer:
Mouse strength (ability to push the heavy block of wood)

#### 14. Bart’s Conclusion
# Brief Explanations:
8/10 microwaved vs. 7/10 non - microwaved mice pushed the block. The difference is small, so microwaving has little to no effect on strength.
# Answer:
Microwaving mice has a minimal or no effect on their strength (only a small difference between groups).

#### 15. Experiment Improvement
# Brief Explanations:
Use more mice or repeat trials to reduce sampling error and confirm results.
# Answer:
Use a larger number of mice or repeat the experiment multiple times.

### 4. Krusty’s Experiment
#### 16. Control Group
# Brief Explanations:
Subject A (sprinkled with original itching powder) is the control.
# Answer:
Subject A (sprinkled with original itching powder)

#### 17. Independent Variable
# Brief Explanations:
The independent variable is the type of itching powder (original vs. experimental).
# Answer:
Type of itching powder (original vs. experimental)

#### 18. Dependent Variable
# Brief Explanations:
The dependent variable is the duration of itching.
# Answer:
Duration of itching (in minutes)

#### 19. Data vs. Advertisement Claim
# Brief Explanations:
The ad claims 50% longer itches. Original: 30 min, experimental: 45 min. $\frac{45 - 30}{30}	imes100\% = 50\%$ longer. So data supports the claim.
# Explanation:
## Step 1: Calculate the percentage increase in itching duration.
The formula for percentage increase is $\frac{	ext{New Value}-	ext{Old Value}}{	ext{Old Value}}	imes100\%$. Here, old value (original powder) is 30 minutes, new value (experimental powder) is 45 minutes.
$\frac{45 - 30}{30}	imes100\%=\frac{15}{30}	imes100\% = 50\%$
## Step 2: Compare with the advertisement claim.
The advertisement claims 50% longer - lasting itches. The calculated increase is 50%, so the data supports the claim.
# Answer:
Yes, the data supports the claim. The experimental powder caused itches to last 50% longer ($\frac{45 - 30}{30}	imes100\% = 50\%$) than the original.

### 5. Lisa’s Experiment (Design)
#### 20. Experiment Performance
# Brief Explanations:
- **Control Group (a):** Family members not using Rogooti (or using a placebo hair product).
- **Independent Variable (b):** Use of Rogooti (applied or not).
- **Dependent Variable (c):** Hair growth speed (measured over time, e.g., length gained per week).
- **Controlled Variables (d):** Same hair - care routine, diet, measurement method, etc., for all volunteers.

Lisa would:
1. Divide family into two groups (control: no Rogooti; experimental: use Rogooti).
2. Ensure controlled variables (e.g., same shampoo, brushing, diet) are consistent.
3. Measure hair growth (e.g., length) at regular intervals (e.g., weekly) for a set time (e.g., 4 weeks).
4. Compare growth between groups.

# Answer:
- **a. Control Group:** Family members not using Rogooti (or using a non - treatment hair product).
- **b. Independent Variable:** Application of Rogooti (yes/no).
- **c. Dependent Variable:** Speed of hair growth (e.g., length of hair grown over time).
- **d. Controlled Variables:** Same hair - care routine, diet, measurement frequency, etc., for all volunteers.

To perform the experiment:
1. Split family into two groups (control and experimental).
2. Have the experimental group use Rogooti, control group use a placebo (or nothing).
3. Keep all other hair - related factors (shampoo, brushing, diet) the same.
4. Measure hair length weekly for 4 + weeks.
5. Compare the average growth of both groups.

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QUESTION IMAGE

Question

Explanation:

1. Smithers' Experiment

1. Control Group

Answer:

2. Independent Variable