Question

A study is being done to test the affects 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.

Answer 1

Although not specified, I am assuming that you want to identify the different variables and groups of this case. To answer this, the different typical factors that make up an experimental set up include: 1) dependent and 2) independent variables; 3) controlled variables; as well as the 4) control and 5) experimental group.

The dependent variable in this case is: the size of the population. While the independent variable is: the habitat space. Controlled variables in this experiment include: type and amount of food, cleanliness of the aquarium, and water temperature. The experimental group are simply the fish being observed. There are no controlled groups in this case depending on your definition. Controlled groups are usually the reference point or standard in experimental setups but this experiment wants to look at the differences of the goldfish with each other and not necessarily to a one particular goldfish and hence no controlled group.

The dependent variable is called as such because it is the one that changes depending on the factors given and is usually the one being observed. The independent variable is named as such because it remains the same throughout the experiment.

Answer 2

The selection of dependent, independent, and controls in the experiment are number of fishes that survived, different sized aquariums, and negative controls are the maintenance, food, water temperature, respectively.

Further Explanation:

A dependent variable defines as the variable which is being tested as well as measured in the scientific experiment. This variable is known to be dependent on the independent variable. In this case, the size of the population is the dependent variable.

The independent variable refers to that variable that is altered or controlled in a scientific experiment in order to check the effects on the dependent variable. In this case, habitat space is an example of this variable

Lastly, a controlled variable refers to the variable which is constant and it is unchanged throughout the course of the experiment. In this case, type, as well as amount of food, cleanliness of aquarium as well as water temperature, are controlled variables.

At the end of the experiment there are no controlled sets in this and these sets are usually known to be the reference point in experimental setups.

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Answer Details:

Grade: High School

Subject: Biology

Chapter: Scientific Experiments

Keywords:

Variables, controlled groups, dependent variable, independent variable, controlled variable, experimental setups.