Question

read the following hypothesis and then answer the question. hypothesis: if a toy car is rolled on a smooth floor, then it will travel farther than on a carpeted floor. which of the following choices is a controlled variable? ∘ type of surface ∘ distance the car travels ∘ toy car used

Explanation:

To determine the controlled variable, we analyze each option:

• "Type of surface" is the independent variable (smooth vs. carpeted) as it's manipulated to observe its effect.
• "Distance the car travels" is the dependent variable as it's the outcome being measured.
• "Toy car used" should be kept constant (controlled) to ensure that any difference in distance is due to the surface, not the car itself.

Answer:

Toy car used