Chart illustrating independent and dependent variables in scientific experiments with visual examples.

It looks like you've uploaded an image containing a table titled "Independent and Dependent Variables Scenarios (Manipulated) (Responding)" with several scientific scenarios. The goal is to identify the independent variable (what is being changed or manipulated) and the dependent variable (what is being measured or observed) in each scenario.

Let’s go through each scenario one by one and determine the correct variables:

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Scenario 1:

> A cow is given a growth hormone and then compared to another cow that was not given a growth hormone. Both cows were weighed at 2 years.

- Independent Variable: Whether or not the cow received the growth hormone
*(This is what was manipulated — one cow got it, the other didn't.)*

- Dependent Variable: Weight of the cow at 2 years
*(This is what was measured — the outcome.)*

✔ Answer:
- Independent: Growth hormone treatment
- Dependent: Cow's weight

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Scenario 2:

> Mosquito repellent is sprayed on one arm and the other arm is not sprayed. The number of mosquito bites is counted after 2 hours.

- Independent Variable: Application of mosquito repellent (sprayed vs. not sprayed)
*(This is the factor being changed.)*

- Dependent Variable: Number of mosquito bites
*(This is what is being measured.)*

✔ Answer:
- Independent: Use of mosquito repellent
- Dependent: Number of mosquito bites

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Scenario 3:

> One group is placed in tap water and another group is placed in salt water. The change in mass is measured after 1 day.

- Independent Variable: Type of water (tap water vs. salt water)
*(This is what was manipulated.)*

- Dependent Variable: Change in mass
*(This is what was measured.)*

✔ Answer:
- Independent: Type of water
- Dependent: Change in mass

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Scenario 4:

> Two identical cars are traveling at 60 km/h. At a certain point, both cars turn on their brakes. The distance it takes for each car to stop is measured.

- Independent Variable: Braking action (turning on brakes) — but note: both cars do the same thing, so this isn’t varied between groups. Wait — actually, if both cars are doing the same, there's no manipulation unless something else differs.

But re-reading: “Both cars turn on their brakes” — so if they’re identical and do the same, maybe we're comparing different braking systems? But the scenario doesn't say that.

Wait — perhaps the braking system is implied as the difference? But it's not stated.

Alternatively, the independent variable might be the type of brake system, but it's not mentioned.

Actually, looking closely: the scenario says "both cars turn on their brakes" — implying the same action. So unless there's a hidden difference (e.g., one has better brakes), this scenario seems incomplete.

But assuming the only difference is the type of brakes, or perhaps one car has a different braking mechanism, then:

- Independent Variable: Type of braking system (or braking condition)
- Dependent Variable: Stopping distance

But since it's not specified, let’s assume the independent variable is the presence of braking, but both cars brake — so again, not clear.

Wait — perhaps the independent variable is the type of surface or brake pad material, but again, not stated.

Alternatively, this scenario may be flawed unless we assume variation in braking conditions.

But most likely, the intended interpretation is:

- Independent Variable: Braking method or condition (e.g., normal brakes vs. worn brakes, though not stated)

But since it says "both cars turn on their brakes", and nothing else is said, maybe the independent variable is the car model, but they're identical.

So perhaps the independent variable is not clearly defined here.

Wait — actually, maybe the independent variable is the time when brakes are applied, but again, not specified.

Alternatively, maybe the independent variable is the braking force, but not mentioned.

Given the ambiguity, perhaps the intended answer is:

- Independent Variable: Braking action (on vs. off)? But both cars apply brakes.

Wait — no, both cars apply brakes.

Unless the scenario meant that one car applies brakes earlier than the other, but it doesn't say.

Alternatively, maybe the type of tire or road surface varies?

But the scenario is unclear.

Wait — let's read carefully: "Two identical cars... both cars turn on their brakes." Then measure stopping distance.

If both cars are identical and both apply brakes, then there is no manipulation unless something else differs.

But perhaps the independent variable is the initial speed? But both are going 60 km/h.

So no variation in the independent variable.

This suggests the scenario might be missing information.

But in many textbook versions of this, the independent variable is the type of brake system — so likely:

- Independent Variable: Type of brake system (e.g., disc vs. drum brakes) — even if not stated, assumed.

Or more likely: The independent variable is whether brakes are applied — but both are.

Wait — perhaps the independent variable is the braking force or braking pressure?

But again, not stated.

Alternatively, maybe the independent variable is the road surface (wet vs. dry), but not mentioned.

Given the lack of detail, perhaps the intended answer is:

- Independent Variable: Braking condition (e.g., hard vs. soft braking) — but not specified.

But based on common interpretations, the most plausible is:

> Perhaps the independent variable is the type of brake pads or brake system, even if not explicitly stated.

But since the image shows two cars, maybe the independent variable is the car model — but they're identical.

Wait — maybe the independent variable is the driver’s reaction time, but not mentioned.

This scenario seems ambiguous.

But in many educational contexts, such a scenario assumes that one car has a different braking system.

So likely:

- Independent Variable: Type of braking system
- Dependent Variable: Stopping distance

✔ Answer (assumed):
- Independent: Type of braking system
- Dependent: Distance to stop

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Scenario 5:

> Pillbugs are placed in a container where they have a choice of a wet or a dry environment. Researchers record how much time was spent in each side.

- Independent Variable: Environment (wet vs. dry)
*(This is what is being offered — the choice between environments.)*

- Dependent Variable: Amount of time spent in each side
*(This is what is being measured.)*

✔ Answer:
- Independent: Moisture level (wet vs. dry)
- Dependent: Time spent in each area

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Scenario 6:

> A stapler is used to staple 100 papers. 4 times 5 times during the test. A different brand of staple performs the same task. It jams 22 times.

- This seems poorly worded. Let's interpret:

A stapler is used to staple 100 papers. This is done multiple times (4 or 5 times). Then a different brand of staple is tested, and it jams 22 times.

Wait — probably means: Different brands of staples are used in the same stapler, and the number of jams is recorded.

So:

- Independent Variable: Brand of staple
*(What is being changed)*

- Dependent Variable: Number of jams
*(What is being measured)*

✔ Answer:
- Independent: Brand of staple
- Dependent: Number of jams

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Scenario 7:

> Cockroaches are exposed to a pesticide. After 3 hours, 95% of the insects are dead.

- Independent Variable: Exposure to pesticide
*(This is what is manipulated — some get pesticide, others don’t? Or dose?)*

But only one condition is described — exposure to pesticide.

So likely, the independent variable is pesticide exposure (present vs. absent), or dose of pesticide.

But since only one group is mentioned, perhaps it's implied that a control group exists.

Assuming the comparison is with non-exposed cockroaches:

- Independent Variable: Pesticide exposure
- Dependent Variable: Percentage of dead insects

✔ Answer:
- Independent: Pesticide exposure
- Dependent: Mortality rate (percent dead)

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✔ Final Answers Summary:

| Scenario | Independent Variable | Dependent Variable |
|--------|----------------------|--------------------|
| 1 | Growth hormone treatment | Cow's weight |
| 2 | Use of mosquito repellent | Number of mosquito bites |
| 3 | Type of water (tap vs. salt) | Change in mass |
| 4 | Type of braking system (assumed) | Stopping distance |
| 5 | Moisture level (wet vs. dry) | Time spent in each environment |
| 6 | Brand of staple | Number of jams |
| 7 | Pesticide exposure | Percentage of dead insects |

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🔍 Explanation:

- Independent Variable: What the experimenter changes or manipulates.
- Dependent Variable: What is measured or observed as a result.

In each case, we ask:
- What was changed? → That’s the independent variable.
- What was measured? → That’s the dependent variable.

For Scenario 4, the wording is ambiguous, but in typical science education, it's interpreted as comparing different braking systems.

Let me know if you'd like this formatted as a completed table!