Question

the variables for this experiment include mass, volume and the materials in the various balls, as well as their densities. in part iii, you will be investigating the questionable baseball. use the drop - down menus to complete the sentences and identify the independent and dependent variables. in part iii, the independent variable, the one that is intentionally manipulated, is. in part iii, the dependent variable, the one that you measure the response in, is.

Explanation:

In an experiment investigating a questionable baseball (likely related to its properties), the independent variable is what's manipulated. Here, the "materials in the various balls" (or more precisely, the type of ball/material, as we might change which ball we test) is manipulated. The dependent variable is what we measure in response, so density (since we measure density based on mass and volume, which depend on the ball's material/type). Wait, but mass, volume, or density? Wait, the experiment is about the questionable baseball, so maybe we manipulate the ball (material) and measure density (or mass/volume). But typically, in such a case, the independent variable is the "material of the ball" (or the ball itself, i.e., the object being tested), and the dependent variable is density (since density = mass/volume, and we measure how density responds to the material). Alternatively, if we are changing the ball (different balls with different materials), the independent variable is the "ball (or its material)" and the dependent variable is density (or mass/volume). But let's think: independent variable is the cause (what we change), dependent is the effect (what we measure). So if we are investigating the baseball (questionable, maybe altered), we might manipulate the ball (e.g., use different balls or the questionable vs normal) as the independent variable, and measure density (since density is mass/volume, and we want to see how density changes with the ball's material/type). So the independent variable is "the materials in the various balls" (or "the ball (material)"), and the dependent variable is "density" (or mass/volume, but density is a key property here).

Answer:

In Part III, the independent variable, the one that is intentionally manipulated, is the materials in the various balls (or the type of ball/material).
In Part III, the dependent variable, the one that you measure the response in, is density (or mass/volume, but density is more likely as it's mass/volume and depends on the material).

(Note: If the drop - down options include "material of the ball" (or similar) for independent and "density" (or "mass", "volume") for dependent, those would be the specific choices. Since the drop - down is not shown, but based on the context, the independent variable is the manipulated factor (material/ball) and dependent is the measured property (density, mass, or volume).)