Question

7 caitlyn wanted to find out what shampoo made her hair the shiniest. everyday she washed her hair with different shampoos and then rated how shiny her hair was, on a scale from 1 - 10. she used pantene, herbal essences, loreal, and just water.

a. independent variable (iv) _____________________
b. dependent variable (dv) _____________________
c. control ____________________________________
d. constants __________________________________
frederick wanted to find out what soil works best for...

Explanation:

Part a: Independent Variable (IV)

The independent variable is the factor that is manipulated or changed in an experiment. Here, Caitlyn is changing the type of shampoo (including water as a control) she uses to wash her hair. So the independent variable is the type of shampoo (Pantene, Herbal Essences, L'Oreal, just water).

The dependent variable is the factor that is measured or observed to see the effect of the independent variable. Caitlyn rates how shiny her hair is (on a 1 - 10 scale) based on the shampoo used, so the dependent variable is the shininess of her hair (rated on a 1 - 10 scale).

A control in an experiment is a group or condition used as a standard of comparison. Using just water to wash her hair serves as a baseline to compare the effects of the shampoos, so the control is washing her hair with just water.

Answer:

Type of shampoo (Pantene, Herbal Essences, L'Oreal, just water)

Part b: Dependent Variable (DV)