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, they're 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.

Identify the:

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 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 "treatment" there is no change in the appearance of the green slime on either side of the shower.

6. What was the iniitial observation?

Identify the-
7. Control Group

8. Independent Variable

9. Dependent Variable

10. What should Homer's conclusion be?

Bart believes that mice exposed to microwaves will become extra strong (maybe he's 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

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

1. In the first scenario, Group B (the group not given the special juice) is the control group. The control group is the group that does not receive the treatment or intervention being tested and is used as a baseline for comparison.

2. The independent variable in this experiment is the special juice. It is the variable that is intentionally changed or manipulated by the researcher.

3. The dependent variable in this experiment is the productivity of the workers, measured by the number of stacks of papers made. It is the variable that is being measured or observed and is expected to change as a result of the independent variable.

4. Smithers' conclusion should be that the special juice did not increase the productivity of the workers. This is indicated by the fact that Group B, which did not receive the special juice, actually produced more stacks of papers than Group A.

5. To improve this experiment, Smithers could introduce randomization and blinding. Randomization involves randomly assigning workers to either Group A or Group B, to ensure that any differences in productivity are not due to pre-existing characteristics of the workers. Blinding involves keeping the workers unaware of whether they are in Group A or Group B, to prevent bias in their productivity.

6. The initial observation was that Homer's shower is covered in a green slime.

7. In Homer's experiment, the control group would be the half of the shower that is sprayed with water. This is the group that does not receive the treatment being tested (coconut juice) and serves as a baseline for comparison.

8. The independent variable in this experiment is the coconut juice. It is the variable that is intentionally changed or manipulated by Homer.

9. The dependent variable in this experiment is the appearance of the green slime in the shower. It is the variable that is being measured or observed and is expected to change as a result of the independent variable.

10. Homer's conclusion should be that coconut juice did not have any effect on getting rid of the green slime in his shower. This is indicated by the fact that there was no change in the appearance of the green slime on either side of the shower after the 3-day treatment.

11. The control group in Bart's experiment would be the group of mice that had not been exposed to the microwave. This is the group that does not receive the treatment being tested (microwave exposure) and serves as a baseline for comparison.

12. The independent variable in this experiment is the microwave exposure. It is the variable that is intentionally changed or manipulated by Bart.

13. The dependent variable in this experiment is the ability of the mice to push the block of wood. It is the variable that is being measured or observed and is expected to change as a result of the independent variable.

16. The control group in Krusty's experiment would be subject A, the test subject sprinkled with the original itching powder. This is the group that does not receive the experimental treatment (experimental itching powder) and serves as a baseline for comparison.

17. The independent variable in this experiment is the type of itching powder used - the original itching powder or the experimental itching powder. It is the variable that is intentionally changed or manipulated by Krusty.

18. The dependent variable in this experiment is the duration of the itching reported by the test subjects. It is the variable that is being measured or observed and is expected to change as a result of the independent variable.

http://www.lhup.edu/sboland/independent_and_dependent_variab.htm

I have the same question in my homework! Well i am very confused... Pls someone help us:( I REALLY NEED HELP, REALLY BADLY!!!....

Study these sites about control group, independent and dependent variables.

Then post your answers, and someone will be happy to comment on them.

http://encarta.msn.com/dictionary_1861688285/control_group.html

http://www.cool-science-projects.com/independent-and-dependent-variables.html