Echinaccea is a plant that grows flowwers with pink petals, which surround a large orange center. Extracts from the plant are said to support or enhance the human immune system.

Does tea, which has been brewed using the extracts of Echinaccea, reduce the duration of cold symptoms?

1. What is the independent variable? explain why

2. dependent variable? explain why

3. control group? explain why

4. what are the controlled variables? how do they differ from the independent variables?

5. Formulate a null hypothesis for the experiment.

6. Formulate an alternative hypothesis for the experiment.

7. If you were to actually run this experiment, how wouldyou determine growth in a plant? (would you be able to have numerical data that would help you decide if there was any change in growth?)