When treatment groups are re-sorted over and over using random assignment in order to create a randomization distribution, what will the mean of the distribution be?(1 point) Responses The distribution mean cannot be predicted. The distribution mean cannot be predicted. The distribution mean will be greater than +1 . The distribution mean will be greater than plus 1 . The distribution mean will be close to zero. The distribution mean will be close to zero. The distribution mean will be less than −1 .
1 answer
The mean of the randomization distribution will be close to zero. In random assignment, the treatment groups are formed in such a way that, over many iterations, there is no systematic bias in assigning participants to the different groups. As a result, the expected value of the differences between group means will center around zero. Therefore, the correct response is:
The distribution mean will be close to zero.
