Answer:

2.

Independent Variable: Type of Socks

Dependent Variable: Temperature of the Feet

Hypothesis: There is no significant relationship between the type of socks and the temperature of the feet.

3.

Independent Variable: Type of Candy

Dependent Variable: Number of Cavities

Hypothesis: There is no significant relationship between the type of candy that students eat and the number of cavities in their teeth.

4.

Independent Variable: Location of the Plant

Dependent Variable: Height of the Plant

Hypothesis: There is no significant relationship between the location of the school plants and the height of the school plants.