5. a. Independent Variable (IV): Type of cleaner used (Lysol, Clorox, Pine-Sol, water)
b. Dependent Variable (DV): Amount of grape juice cleaned (measured by how much was left on the paper towel)
c. Control: Same countertop surface, same amount of grape juice, same paper towel type, same wiping technique
d. Constants: Amount of cleaner applied, time allowed for cleaning, person doing the cleaning
6. a. Independent Variable (IV): Type of shampoo used (Purpoo, Herbal Essences, L’Oreal, just water)
b. Dependent Variable (DV): Hair shininess (measured on a scale from 1-10)
c. Control: Same person’s hair, same washing frequency, same drying method
d. Constants: Amount of shampoo used, water temperature, duration of washing, time between washes
7. a. Independent Variable (IV): Type of soil used (potting soil, clay, sand, soil from yard)
b. Dependent Variable (DV): Height and number of leaves of bean plants after one week
c. Control: Same type and number of bean seeds, same pot size, same light exposure, same watering schedule
d. Constants: Amount of water given, room temperature, duration of experiment (one week)
8. a. Independent Variable (IV): Brand of battery used (Duracell, Energizer, Kroger, EverReady)
b. Dependent Variable (DV): Time until the clock stops (battery life)
c. Control: Same clock model, same settings, same ambient conditions
d. Constants: Clock usage pattern, starting time of test, environmental temperature
Parent Tip: Review the logic above to help your child master the concept of independent and dependent variables worksheet science.
