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
Experimental group is defined as a group of participants who receive the independent variable while control group receive no independent variable. Except independent variable, all variables should be held the same. In addition dependent variable is the variable which receive the effect from independent variable and it will be measured to determined whether the independent variable has its effect on the groups. Both of them are the necessary for scientific research and use to draw an causal conclusion.
Before explaining these two groups, independent variable should be identified. In the example we can see there were two groups of women: one with regular exercise and one without. So we can believe regular exercise was the independent variable in this example. Then we know the group which did regular exercise was the experimental group and the one did not do regular exercise was the control group.
By comparing these two groups, we can draw a causal effect conclusion. As both groups have the same conditions (same variables were being kept, i.e. all women (no men)) but only one is different (i.e. regular exercise in the example), so we can believe the independent variable has effect on the dependent variable (i.e. blood pressure).參考資料： Psychology Research Assistant