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lisa is working on a science project. her task is to answer the questio…

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.

  1. describe how lisa would perform this experiment. identify the control group, and the independent and dependent variables in your description.

Explanation:

Step1: Define Variables

  • Independent Variable (IV): Use of Rogooti (applied or not, or different concentrations).
  • Dependent Variable (DV): Speed of hair growth (measured as length increase over time, e.g., weekly).
  • Control Group (CG): Family members not using Rogooti (use a placebo or nothing).
  • Experimental Group (EG): Family members using Rogooti.

Step2: Experimental Setup

  1. Recruit family volunteers (same age group, similar hair types for consistency).
  2. Divide into CG and EG randomly (or by similar hair conditions).
  3. Instruct EG to use Rogooti as directed, CG to use a placebo (e.g., plain shampoo) or no product.
  4. Measure initial hair length of all participants (using a ruler, from scalp to end, same spot).
  5. Have all follow same hair care routine (washing frequency, brushing, etc.) except for Rogooti use.
  6. Measure hair length weekly for a set period (e.g., 4 weeks).
  7. Calculate hair growth (final length - initial length) for each, then average for CG and EG.

Step3: Analyze Data

Compare average hair growth between CG and EG. If EG has significantly more growth, Rogooti affects hair growth speed.

Answer:

  1. Variables:
  • Independent: Rogooti use (yes/no or dosage).
  • Dependent: Hair growth speed (length change over time).
  • Control Group: Family not using Rogooti (placebo/no product).
  • Experimental Group: Family using Rogooti.
  1. Procedure:
  • Recruit volunteers (similar hair type/age).
  • Measure initial hair length.
  • Assign to control (no Rogooti) or experimental (Rogooti) groups.
  • Follow same hair care (except Rogooti).
  • Measure hair length weekly (4+ weeks).
  • Calculate growth (final - initial) and compare groups.

If experimental group’s growth > control, Rogooti increases hair growth speed.