experimental and control group
Explain the terms experimental group and control group and illustrate the two concepts using the following example.
'Dr.So measures the blood pressure of 50 women. She has 25 women exercise three times a week for eight weeks. She instructs the other 25 women exercise. After the eight weeks, Dr So measures the blood pressure of all 25 women. She finds that blood pressure decreased for the exercising women ,but not for the others'
- 7 年前最佳解答
An experimental group refer to a group that is exposed to the specific conditions of the experiment, or in other words, the independent variable.
A control group is a group that is set aside and is not influenced by the independent variable; it is often used to make clear contrasts between the experimental results (from the experimental group) to its original state/or the state in which no independent variables on involved.
So in this case, the 25 women who exercises 3 times a week for 8 weeks, is the experimental group, because the 25 women were given a "condition" (independent variable), in which they must exercise 3 times a week for 8 weeks. The group of the other 25 women is the control group, because they were not affected by the independent variable, they're just being compared with the experimental group.
Another simple example can be that, you want to see whether candy can affect the rate of children doing homework, so you're conducting an experiment with 10 children. The 5 children in the experimental group are given candy, and are ask to do homework, while the other five (control group) are not given candy and are asked to do homework. For the results of this experiment you would be comparing the experimental group with the control group, such as, children with candy worked a lot faster than those children without candy. So in other words, the control group is like a standard where you compare with to see your experimental results.
I hope this information will help you in some way!參考資料： me