Burt believes that mice exposed to microwaves will become extra strong. 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. Experimental Group 13. Independent Variable 14. Dependent Varlable 15. How could Bart’s experiment be Improved? answer 11-15 please 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. Experimental Group 18. Independent Variable 19. Dependent Variable 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 control and experimental group, and the Independent and dependent variables in your description. X Bort
The Correct Answer and Explanation is :
Here are the answers and explanations for the scenarios:
Bart’s Experiment
11. Control Group: The 10 mice that were not exposed to microwaves.
12. Experimental Group: The 10 mice exposed to microwaves.
13. Independent Variable: Exposure to microwaves (microwaved or not microwaved).
14. Dependent Variable: The number of mice able to push the block of wood away.
15. How could Bart’s experiment be improved?
- Increase the sample size to get more reliable results.
- Randomly assign mice to groups to avoid bias.
- Use a standardized block of wood with consistent weight for all tests.
- Ensure other factors (like age, size, or health of the mice) are controlled.
- Conduct multiple trials to verify the results.
Explanation:
Bart’s experiment is a basic setup to test the effects of microwave exposure on the strength of mice. The control group provides a baseline for comparison, and the independent variable (microwave exposure) is directly tested. The dependent variable (ability to move the block) measures the outcome. However, the experiment lacks rigor in its design. Factors such as sample size and randomization need attention to eliminate bias and improve reliability.
Krusty’s Experiment
16. Control Group: The test subject using the original itching powder (Subject A).
17. Experimental Group: The test subject using the new itching powder (Subject B).
18. Independent Variable: Type of itching powder used (original or new).
19. Dependent Variable: Duration of the itching (minutes).
Explanation:
Krusty is testing whether the new itching powder causes longer-lasting itches. The control group (Subject A) uses the original powder, while the experimental group (Subject B) uses the new powder. The independent variable is the type of powder, and the dependent variable is the duration of the itch. Krusty’s design is simple but could benefit from a larger group of test subjects to ensure the results are consistent across individuals.
Lisa’s Experiment
20. Experiment Description:
Lisa can divide her family into two groups. The control group will not use Rogooti, while the experimental group will apply Rogooti daily. Both groups should have their hair growth measured (in millimeters) weekly over a set period (e.g., one month). Factors like diet, health, and initial hair length should be controlled to ensure fair comparisons.
Control Group: Family members who do not use Rogooti.
Experimental Group: Family members who apply Rogooti.
Independent Variable: Use of Rogooti (applied or not).
Dependent Variable: The rate of hair growth (measured in millimeters per week).
Explanation:
Lisa’s experiment examines whether Rogooti influences hair growth. The control group sets a baseline without the product, while the experimental group uses it. Measuring hair growth consistently over time ensures that data reflects the product’s effect. Controlling external factors (like health) prevents confounding variables from skewing results. This design allows for clear conclusions about Rogooti’s efficacy.