Question

the variables for this experiment include mass, volume, and the materials in the various balls, as well as their densities. in part i, you will be comparing a table tennis ball and a golf ball. use the drop - down menus to complete the sentences and identify the independent and dependent variables.
in part i, the independent variable, the one that is intentionally manipulated, is
in part i, the dependent variable, the one that you measure the response in, is
options in the drop - down menu: mass, volume, material, density

Explanation:

In an experiment, the independent variable is what is changed or manipulated. Here, the type of ball (table tennis vs. golf) which relates to the material (as they are made of different materials) is manipulated. The dependent variable is what is measured as a result. Density is calculated from mass and volume ($
ho=\frac{m}{V}$), and since mass and volume are measured to find density, density is the result of the manipulation of the ball type (material - as different balls have different inherent properties affecting mass and volume which then affect density).

Answer:

In Part I, the independent variable, the one that is intentionally manipulated, is material. In Part I, the dependent variable, the one that you measure the response in, is density.