Question

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 5 hours. 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 other mice were able to do the same.

1. control group:
2. independent (manipulated) variable:
3. dependent (responding) variable:
4. what should barts conclusion be?
5. 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.

1. control group:
2. independent (manipulated) variable:
3. dependent (responding) variable:
4. 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.

1. write a hypothesis for an experiment that lisa might conduct.

Explanation:

1. The 10 mice that had not been exposed to microwaves are the control group as they are the baseline for comparison.
2. The independent variable for Bart's experiment is exposure to microwaves since it is the factor he manipulates.
3. The dependent variable is the strength of the mice (ability to push the block) as it is what is being measured and is affected by the independent variable.
4. Bart could conclude that exposure to microwaves may have increased the strength of the mice since more microwave - exposed mice could push the block.
5. Bart's experiment could be improved by increasing the sample size, repeating the experiment multiple times, and controlling for other variables like diet and age of mice.
6. The control group for Krusty's experiment is the subject (A) sprinkled with the original itching powder as it is the standard for comparison.
7. The independent variable is the type of itching powder (original vs. experimental) as it is the variable being changed.
8. The dependent variable is the duration of itching as it is the response being measured.
9. The data does not support the advertisement's claim. The experimental powder caused itching for 45 minutes and the original for 30 minutes, which is not a 50% longer - lasting itch.
10. A possible hypothesis for Lisa's experiment: Rogooti (the commercial hair product) will increase the speed of hair growth in her family members who use it compared to those who do not.

Answer:

1. The 10 non - microwave - exposed mice.
2. Exposure to microwaves.
3. The strength of the mice (ability to push the block).
4. Exposure to microwaves may have increased the strength of the mice.
5. Increase sample size, repeat the experiment, control for other variables.
6. Subject A sprinkled with the original itching powder.
7. The type of itching powder.
8. The duration of itching.
9. No, the data does not support the claim as the experimental powder caused itching for 45 minutes and the original for 30 minutes, not a 50% longer - lasting itch.
10. Rogooti will increase the speed of hair growth in family members who use it compared to those who do not.