Independent & Dependent Variables Practice - Free Printable
Educational worksheet: Independent & Dependent Variables Practice. Download and print for classroom or home learning activities.
PNG
300×380
22.6 KB
Free · Personal Use
Quality Assured by Worksheets Library Team
Reviewed for educational accuracy and age-appropriateness
ID: #1591394
⭐
Show Answer Key & Explanations
Step-by-step solution for: Independent & Dependent Variables Practice
▼
Show Answer Key & Explanations
Step-by-step solution for: Independent & Dependent Variables Practice
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 explain the correct variables:
---
> 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 the cow received the growth hormone (yes/no).
- Dependent Variable: Weight of the cow at 2 years.
- Explanation: The researcher manipulates whether the hormone is given (independent), and measures the resulting weight (dependent).
---
> 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).
- Dependent Variable: Number of mosquito bites.
- Explanation: The presence or absence of repellent is manipulated; the number of bites is the outcome measured.
---
> One group is placed in tap water and another group is placed in salt water. The change in their mass is measured after 1 day.
- Independent Variable: Type of water (tap water vs. salt water).
- Dependent Variable: Change in mass.
- Explanation: The type of water is controlled by the experimenter; the mass change is the response.
---
> Two different cars are traveling at 60 mph. At a certain point, both cars turn on their brakes. The distance it takes for each car to stop is measured.
- Independent Variable: Type of car (different models).
- Dependent Variable: Distance to stop.
- Explanation: Although speed is constant, the car type is varied; stopping distance is the measured result.
---
> 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).
- Dependent Variable: Amount of time spent in each side.
- Explanation: The environment is manipulated; the behavior (time spent) is recorded.
---
> A stapler is used to staple 100 papers. 4 times 5 times during the same trial, a different brand of staple performs the same task. It jams 22 times.
- Independent Variable: Brand of staple.
- Dependent Variable: Number of times the stapler jams.
- Explanation: The brand of staple is changed; the jam frequency is the outcome.
---
> Cockroaches are exposed to a pesticide. After 3 hours, 95% of the insects are dead.
- Independent Variable: Exposure to pesticide.
- Dependent Variable: Percentage of insects dead.
- Explanation: The pesticide exposure is the treatment; the mortality rate is the measured effect.
---
| Scenario | Independent Variable | Dependent Variable |
|--------|----------------------|-------------------|
| 1 | Growth hormone (given or not) | Cow's weight at 2 years |
| 2 | Application of mosquito repellent | Number of mosquito bites |
| 3 | Type of water (tap vs. salt) | Change in mass |
| 4 | Type of car | Distance to stop |
| 5 | Environment (wet vs. dry) | Time spent in each side |
| 6 | Brand of staple | Number of jams |
| 7 | Exposure to pesticide | Percentage of insects dead |
---
✔ This completes the identification of independent and dependent variables for all scenarios. Let me know if you'd like this formatted as a downloadable table or need help turning it into a worksheet!
Let’s go through each scenario one by one and explain the correct variables:
---
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 the cow received the growth hormone (yes/no).
- Dependent Variable: Weight of the cow at 2 years.
- Explanation: The researcher manipulates whether the hormone is given (independent), and measures the resulting weight (dependent).
---
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).
- Dependent Variable: Number of mosquito bites.
- Explanation: The presence or absence of repellent is manipulated; the number of bites is the outcome measured.
---
Scenario 3:
> One group is placed in tap water and another group is placed in salt water. The change in their mass is measured after 1 day.
- Independent Variable: Type of water (tap water vs. salt water).
- Dependent Variable: Change in mass.
- Explanation: The type of water is controlled by the experimenter; the mass change is the response.
---
Scenario 4:
> Two different cars are traveling at 60 mph. At a certain point, both cars turn on their brakes. The distance it takes for each car to stop is measured.
- Independent Variable: Type of car (different models).
- Dependent Variable: Distance to stop.
- Explanation: Although speed is constant, the car type is varied; stopping distance is the measured result.
---
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).
- Dependent Variable: Amount of time spent in each side.
- Explanation: The environment is manipulated; the behavior (time spent) is recorded.
---
Scenario 6:
> A stapler is used to staple 100 papers. 4 times 5 times during the same trial, a different brand of staple performs the same task. It jams 22 times.
- Independent Variable: Brand of staple.
- Dependent Variable: Number of times the stapler jams.
- Explanation: The brand of staple is changed; the jam frequency is the outcome.
---
Scenario 7:
> Cockroaches are exposed to a pesticide. After 3 hours, 95% of the insects are dead.
- Independent Variable: Exposure to pesticide.
- Dependent Variable: Percentage of insects dead.
- Explanation: The pesticide exposure is the treatment; the mortality rate is the measured effect.
---
Final Answer Table:
| Scenario | Independent Variable | Dependent Variable |
|--------|----------------------|-------------------|
| 1 | Growth hormone (given or not) | Cow's weight at 2 years |
| 2 | Application of mosquito repellent | Number of mosquito bites |
| 3 | Type of water (tap vs. salt) | Change in mass |
| 4 | Type of car | Distance to stop |
| 5 | Environment (wet vs. dry) | Time spent in each side |
| 6 | Brand of staple | Number of jams |
| 7 | Exposure to pesticide | Percentage of insects dead |
---
✔ This completes the identification of independent and dependent variables for all scenarios. Let me know if you'd like this formatted as a downloadable table or need help turning it into a worksheet!
Parent Tip: Review the logic above to help your child master the concept of independent vs dependent variable worksheet with answers.
