Question

the passage below describes an experiment. read the passage and think about the variables that are described. grayson noticed that some of the footballs his team used during practice were not fully inflated. he wondered whether fully inflated footballs would travel farther than footballs with a lower air pressure. to find out, grayson collected 20 standard footballs. he fully inflated ten of them to an air pressure of 13 pounds per square inch. he inflated the remaining ten to an air pressure of 10 pounds per square inch. grayson used a football launcher to launch a ball across a football field. he measured the distance the football traveled and then launched the next ball. grayson repeated this with all 20 balls. which of the following was an independent variable in this experiment? the distance the footballs traveled the air pressure in the footballs

Explanation:

In an experiment, the independent variable is the factor that is deliberately changed or manipulated by the experimenter. Here, Grayson changes the air - pressure in the footballs (13 psi and 10 psi). The distance the footballs travel is the dependent variable, which is measured and is expected to be affected by the independent variable.

Answer:

the air pressure in the footballs