Question

1. juanita wanted to find out what toothpaste made teeth the cleanest. everyday she brushed her teeth with a different product and then took a plaque test to see how much plaque was left. she used crest, colgate, close - up, and water. independent variable (iv): dependent variable (dv): control:

Explanation:

The independent variable is what is being changed, which is the type of tooth - paste (Crest, Colgate, Close - up, water). The dependent variable is what is being measured, which is the amount of plaque left. The control is the baseline for comparison, and in this case, water (brushing with just water) serves as the control as it is a non - toothpaste option.

Answer:

Independent Variable (IV): Type of toothpaste (Crest, Colgate, Close - up, water)
Dependent Variable (DV): Amount of plaque left
Control: Water