Question

A student conducted an experiment to determine if the temperature of the water affected the breathing rate of the freshwater sunfish. Temperature was measured in degrees Celsius and breathing rate was per minute.


What is the dependent variable?

Answer 1

The dependent variable is the animal's breathing rate. It changes in response to the change in water temperature -independent variable-.

What are dependent and independent variables?

When conducting an experiment, we must always consider the involved variables.

• Independent variables are those modified or changed by the researcher to study how this change affects another variable and hence the results. This variable is not affected by any other one but influences or causes a reaction in other variables.

• The dependent variable is the one influenced by the independent variable, and is affected by any change on this last one. Its response might be either directly proportional or inversely proportional to the change in the independent variable.

In the exposed example,

The experiment was done to determine if water temperature influences on the fishes' breathing rate.

Variables are

• water teperature,
• fishe's breathing rate.

Water temperature influences the animal's breathing, so this is the independent variable.

The animal's breathing rate changes as temperature changes. So this is the dependent variable.

The dependent variable is then the animal's breathing rate. It changes in response to the change in water temperature -independent variable-.

You will learn more about dependent and independent variables at

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