What is another name for the tea without the Echinacea added? To test the prediction, scientists randomly assigned fifty female workers at a hospital who had gotten sick into one of two groups, each containing twenty-five individuals. One group of twenty-five was given Echinacea tea to drink twice daily until the cold symptoms were gone and the other group was given tea without Echinacea extract twice daily until the cold symptoms were gone. Participants were told to stop taking the tea when their cold symptoms were gone and to report that date to the scientist. Testable prediction: If we give sick people tea with Echinacea, then it will take less days for their cold symptoms to go away Alternative prediction: If we do not give sick people tea with Echinacea, then it will take more days for their symptoms to go away Group of answer choices experimental group the test subject the placebo controlled variable