Question

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 group, and the independent and dependent variables in your description.

Explanation:

1. Experimental Design: Lisa should divide her family into two groups: the experimental group (uses Rogooti) and the control group (uses a placebo or no hair product). Ensure other factors like diet, sleep, and hair care routine are the same for both groups.
2. Variables:

• Independent Variable: Use of Rogooti (whether a family member uses Rogooti or not).
• Dependent Variable: Speed of hair growth (measured, e.g., by length increase over a set time, like 4 weeks).
• Control Group: Family members not using Rogooti (to compare against the experimental group).

1. Procedure:

• Measure initial hair length of all family members.
• Assign half to use Rogooti as per instructions (experimental), half as control (no product or placebo).
• Maintain consistent conditions (same hair washing frequency, diet, etc.) for all.
• After 4 weeks, measure hair length again.
• Calculate hair growth (final - initial length) for each group and compare.

Answer:

To perform the experiment:

1. Divide Volunteers: Split family into two groups (e.g., Group A: experimental, Group B: control).
2. Initial Measurement: Measure each person’s hair length (e.g., in cm) at the start.
3. Apply Treatment: Group A uses Rogooti as directed; Group B uses no hair product (or a placebo, like water) on their hair.
4. Control Conditions: Ensure all have the same hair care routine, diet, sleep, and other factors that might affect hair growth.
5. Final Measurement: After a set time (e.g., 4 weeks), re - measure hair length for all.
6. Analyze Data: Calculate hair growth (final length - initial length) for each group. Compare the average growth of Group A (experimental) and Group B (control).

• Control Group: Group B (no Rogooti use).
• Independent Variable: Use of Rogooti (whether a person uses Rogooti or not).
• Dependent Variable: Speed of hair growth (measured by length increase over time).