Restricted randomization

Restricted randomization is a way of ensuring fairness in a scientific study. It means that the scientist can divide the people participating in the study into groups that are equal in some way. This way, the scientist can make sure that the groups are similar and more likely to get the same results from the study. For example, if a scientist was doing a study about how exercise affects people's health, they could divide the people into two groups based on their gender. That way, the results from the study will not be affected by gender and will be more accurate.