Answer:
Concealment method
Step-by-step explanation:
The distribution concealment technique in a randomized survey masks the process of grouping study patients into treatment groups, so that this information can not be manipulated. Sufficient invisibility of distribution helps to deter participants in the study from choosing care assignments for items.
Withdraw or delete from evaluation by using a false name to avoid or prohibit identification or revealing of one's identity.
by using this method manager will able to uncover the frauds.