Question

1. A study is being done to test the effects of habitat space on the size of fish populations. Different sized aquariums are set up with six goldfish in each one. Over a period of six months, the fish are fed the same type and amount of food. The aquariums are equally maintained and cleaned throughout the experiment. The temperature of the water is kept constant. At the end of the experiment the number of surviving fish are surveyed. a. Independent Variable: b. Dependent Variable: c. Controlled Variables/Constants: d. Experimental Controls/Control Groups:

Answer 1

Answer:

a. Independent Variable: different sized aquariums

b. Dependent Variable: number of surviving fish

c. Controlled Variables/Constants: amount and type of food, aquarium maintenance and water temperature

d. Experimental Controls/Control Groups: none

Explanation:

In an experiment, the dependent variable is the condition that is being measured or tested in the experimental procedure, while the independent variable isn't changed and serves to measure the outcome of the dependent variable. Moreover, the constant variables are those conditions that stay the same in the experiment. As observed in the case above described, an experiment usually has multiple constant variables. Finally, a control group is composed of individuals/research subjects who do not receive the experimental treatment, and therefore they can be used to compare the outcomes observed in the experimental groups.