Question

experimental design quiz
highlight the independent variable.
a pet store owner wants to see what will happen if they feed tanks of goldfish different amounts of food. one tank of goldfish is fed the normal amount which is once a day, a second tank is fed twice a day, and a third tank is fed four times a day during a six - week study. the fishes body fat is recorded daily.

Explanation:

In an experimental design, the independent variable is the factor that is manipulated by the experimenter. Here, the pet store owner is changing the number of times the goldfish are fed (once a day, twice a day, four times a day). The body fat of the fish is the dependent variable (measured outcome), and the six - week study is the duration. So the independent variable is the amount of food (represented by the number of times the goldfish are fed per day).

Answer:

The independent variable is the number of times the goldfish are fed per day (or the amount of food, where the amount is manipulated by changing the feeding frequency: once a day, twice a day, four times a day).