What is the independent variable

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Problem: You are conducting an experiment to determine if increased ultraviolet radiation from the decrease in the ozone layer is killing off frog tadpoles. After examining all of the data available in the library, you decide to go with a hypothesis that increased ultraviolet radiation from the sun is killing off the tadpoles.

You design an experiment with a control and an experimental group. Group 1 involves 100 tadpoles in a five gallon container of water, which is covered by glass (knowing that the glass will filter out the ultraviolet radiation). Group 2 will be set up exactly like group 1, except that instead of being covered with glass, it is covered with an acrylic Plexiglas, which will not filter out the ultraviolet radiation. You then place the groups outside for a period of a month, and observe the results.


Group 1 Group 2

Number of tadpoles 100 100

started with

Number finished 96 96

Using this information, answer the following questions.

a. What is the independent variable and what is the dependent variable?

b. Does the information from this experiment support the hypothesis?

c. If no, then what might be causing the decrease in frog populations?

d. Which is the control group, and which is the experimental group?

e. What is the difference between the two groups? Should they be different in any other way?

Reference no: EM132438898


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