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You know that caffeine is a stimulant, and you are curious about the effect that is has on heart rate. You design an experiment to test the effects of caffeine on the heart rate of Daphnia. You obtain 240 Daphnia and divide them into 6 groups, two beakers for each treatment, that will receive: 0%, 1%, 2%, 3%, 4%, and 5% caffeine water solution.
1. Compose a hypothesis for the experiment.
2. Identify the independent variable, ... the dependent variable.
3. What are some variables you would want to remain the same during the experiment?
4. Identify the control group. Why is a control group important?
5. Why would you use two beakers for each treatment, or what is the purpose of the repetition?
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How can you use the scientific method to find and address possible problems in your research design?
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Write a paragraph in your own words, that answers the following questions. DO NOT copy and paste text from the web. Cite any sources.
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