bart has a science fair project due this week and decides to determine if band - aids really speed up healing. he has just had a skateboarding accident and had cuts on both his knees.
on his left knee, he covers the cut with a bandaid and then he leaves the right knee uncovered.
at the end of the week he removes the bandaid and compares the two cuts. the one that was covered seems mostly healed, but the one that was not covered looks red and has not healed.
identify the -
9 control
10. manipulated (independent) variable
11. responding (dependent) variable
12. what should his conclusion be?

marge has been trying to get maggie to sleep through the night without her pacifier. a friend suggests that putting lavender oil on maggie’s pillow will help her sleep.
the first night, marge puts maggie to sleep without her pacifier. maggie woke up in an hour crying.
the second night, marge put lavender oil on the pillow. maggie still woke up after an hour crying.
identify the -
13. control
14. manipulated (independent) variable
15. responding (dependent) variable
16. what should marge’s conclusion be?

lisa is also working on her own science fair project and wants to make sure her project is better than bart’s. she wants to study the effect of radio waves on plant growth.
17. describe how lisa would perform this experiment. identify the dependent and independent variables in her experiment.

Question

bart has a science fair project due this week and decides to determine if band - aids really speed up healing. he has just had a skateboarding accident and had cuts on both his knees.
on his left knee, he covers the cut with a bandaid and then he leaves the right knee uncovered.
at the end of the week he removes the bandaid and compares the two cuts. the one that was covered seems mostly healed, but the one that was not covered looks red and has not healed.
identify the -
9 control
10. manipulated (independent) variable
11. responding (dependent) variable
12. what should his conclusion be?

marge has been trying to get maggie to sleep through the night without her pacifier. a friend suggests that putting lavender oil on maggie’s pillow will help her sleep.
the first night, marge puts maggie to sleep without her pacifier. maggie woke up in an hour crying.
the second night, marge put lavender oil on the pillow. maggie still woke up after an hour crying.
identify the -
13. control
14. manipulated (independent) variable
15. responding (dependent) variable
16. what should marge’s conclusion be?

lisa is also working on her own science fair project and wants to make sure her project is better than bart’s. she wants to study the effect of radio waves on plant growth.
17. describe how lisa would perform this experiment. identify the dependent and independent variables in her experiment.

Accepted Answer

### Question 9 (Bart's experiment - Control)
# Brief Explanations:
In Bart's experiment, the control is the part of the experiment that is not subjected to the independent variable (band - aid). His right knee, which was left uncovered (no band - aid), serves as the control because it provides a baseline to compare the healing of the knee with the band - aid (left knee).
# Answer:
The control in Bart's experiment is his right knee (the cut on the right knee that was left uncovered).

### Question 10 (Bart's experiment - Manipulated (Independent) Variable)
# Brief Explanations:
The independent variable is the factor that is changed or manipulated in an experiment. In Bart's experiment, he is testing if band - aids speed up healing. So, the presence or absence of the band - aid is the variable he manipulates. Specifically, the application of the band - aid (on the left knee) is the independent variable.
# Answer:
The manipulated (independent) variable in Bart's experiment is the application of the band - aid (or whether the cut is covered with a band - aid).

### Question 11 (Bart's experiment - Responding (Dependent) Variable)
# Brief Explanations:
The dependent variable is the factor that is measured or observed to see the effect of the independent variable. In Bart's experiment, he is interested in how fast the cut heals. So, the healing rate (or the state of healing of the cut) is the dependent variable, as it depends on whether the cut was covered with a band - aid.
# Answer:
The responding (dependent) variable in Bart's experiment is the healing rate (or the extent of healing) of the cut.

### Question 12 (Bart's experiment - Conclusion)
# Brief Explanations:
Bart compared the healing of the cut with a band - aid (left knee) and without a band - aid (right knee). The cut with the band - aid was mostly healed, while the one without was not. So, from this experiment, he can conclude that band - aids seem to speed up the healing of cuts (at least in his case with the two knee cuts).
# Answer:
Bart's conclusion should be that band - aids appear to speed up the healing of cuts, as the cut covered with a band - aid (left knee) healed more than the uncovered cut (right knee) over the week.

### Question 13 (Marge's experiment - Control)
# Brief Explanations:
In Marge's experiment, the control is the condition that does not have the independent variable (lavender oil). The first night, when Maggie slept without her pacifier and without lavender oil on the pillow, this serves as the control. It provides a baseline to compare the effect of lavender oil on Maggie's sleep.
# Answer:
The control in Marge's experiment is the first night when Maggie slept without her pacifier and without lavender oil on the pillow.

### Question 14 (Marge's experiment - Manipulated (Independent) Variable)
# Brief Explanations:
The independent variable is what is changed in the experiment. Marge is testing if lavender oil on the pillow helps Maggie sleep. So, the presence or absence of lavender oil on the pillow is the variable she manipulates. Specifically, the application of lavender oil on the pillow is the independent variable.
# Answer:
The manipulated (independent) variable in Marge's experiment is the application of lavender oil on Maggie's pillow.

### Question 15 (Marge's experiment - Responding (Dependent) Variable)
# Brief Explanations:
The dependent variable is what is measured to see the effect of the independent variable. In Marge's experiment, she is interested in how Maggie sleeps (specifically, how long she stays asleep). So, the length of time Maggie stays asleep (or her sleep duration) is the dependent variable, as it depends on whether there was lavender oil on the pillow.
# Answer:
The responding (dependent) variable in Marge's experiment is Maggie's sleep duration (how long she stays asleep).

### Question 16 (Marge's experiment - Conclusion)
# Brief Explanations:
Marge compared Maggie's sleep with and without lavender oil on the pillow. In both cases, Maggie woke up crying after an hour. So, there was no difference in Maggie's sleep duration with or without lavender oil. Thus, she can conclude that lavender oil on the pillow did not help Maggie sleep longer (or did not have an effect on her ability to sleep through the night in this experiment).
# Answer:
Marge's conclusion should be that lavender oil on the pillow did not help Maggie sleep longer, as Maggie's sleep duration (waking up after an hour crying) was the same on the night with and without lavender oil on the pillow.

### Question 17 (Lisa's experiment - Procedure, Independent and Dependent Variables)
# Brief Explanations:
To study the effect of radio waves on plant growth, Lisa can follow these steps:
1. **Procedure**:
   - Select a number of identical plants (same species, same size, same age, etc.).
   - Divide the plants into two groups: an experimental group and a control group.
   - For the experimental group, expose the plants to radio waves (using a radio wave source) for a set period of time each day. For the control group, keep the plants in the same environment but without exposure to radio waves.
   - Ensure that all other factors (such as light, water, temperature, soil type) are kept constant for both groups.
   - Over a period of time (e.g., weeks), measure the growth of the plants (height, number of leaves, etc.).
2. **Independent Variable**: The presence or absence of radio waves (or the intensity of radio waves, if varying intensity is part of the experiment).
3. **Dependent Variable**: The growth of the plants (e.g., plant height, number of leaves, biomass), as it depends on the exposure to radio waves.
# Answer:
- **Procedure**:
  - Select several identical plants (same species, size, age).
  - Split them into two groups: experimental (exposed to radio waves) and control (not exposed to radio waves).
  - Keep all other conditions (light, water, temperature, soil) constant.
  - Expose the experimental group to radio waves daily for a set time.
  - Measure plant growth (height, leaves, etc.) over time.
- **Independent Variable**: Exposure to radio waves (or radio wave intensity).
- **Dependent Variable**: Plant growth (e.g., height, number of leaves).

Sovi.AI - AI Math Tutor

QUESTION IMAGE

Question

Explanation:

Question 9 (Bart's experiment - Control)

Answer:

Question 10 (Bart's experiment - Manipulated (Independent) Variable)