Question

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 produce. one test subject (a) is sprinkled with the original itching powder, and another test subject (b) is sprinkled with the experimental itching powder. subject a reported having itches for 30 minutes, subject b reported to have itches for 10 hours. 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. 16 identify the control group 17 manipulated (independent) variable 18 responding (dependent) variable 19 what should krusty’s conclusion be? 20 describe how lisa would perform this experiment. identify the control group, and the manipulated and responding variables in your description.

Explanation:

Step1: Identify control group

Subject A, who is sprinkled with the original itching powder, is the control group as it is the baseline for comparison.

Step2: Identify independent variable

The type of itching powder (original vs new experimental) is the manipulated (independent) variable as it is the factor being changed.

Step3: Identify dependent variable

The duration of itching is the responding (dependent) variable as it is the outcome that is measured and is expected to depend on the type of itching powder.

Step4: Draw conclusion

Based on the data, the new itching powder caused much - longer lasting itches (10 hours compared to 30 minutes), so Krusty can conclude that the new itching powder causes significantly longer - lasting itches.

Step5: Lisa's experiment description

1. Divide family volunteers into two groups. One group (control group) will not use Rogooti, while the other group (experimental group) will use Rogooti.
2. Measure the initial hair length of all volunteers.
3. Over a set period (e.g., a month), have the experimental group use Rogooti as per the product instructions and the control group use a placebo or no hair product.
4. After the set period, measure the hair length of all volunteers again.
5. Calculate the growth in hair length for each volunteer.
6. Compare the average hair growth between the control group and the experimental group.

• Control group: Family members not using Rogooti.
• Manipulated (independent) variable: Use of Rogooti (yes or no).
• Responding (dependent) variable: Amount of hair growth.

Answer:

1. Subject A (sprinkled with original itching powder)
2. Type of itching powder (original vs new experimental)
3. Duration of itching
4. The new itching powder causes significantly longer - lasting itches.
5. Divide family volunteers into two groups. Control group uses no Rogooti, experimental group uses Rogooti. Measure initial and final hair lengths over a set period. Calculate hair growth and compare between groups. Control group: Family members not using Rogooti; Manipulated variable: Use of Rogooti (yes or no); Responding variable: Amount of hair growth.