Question

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)
the distribution mean will be close to zero.
the distribution mean cannot be predicted.
the distribution mean will be greater than + 1.
the distribution mean will be less than - 1.

Explanation:

In randomization for treatment groups, when we re - assign groups randomly, the null hypothesis (of no treatment effect) implies that the mean of the randomization distribution should be close to zero. This is because, on average, the treatment and control groups should not differ systematically when there's no true treatment effect. The other options (can't be predicted, greater than +1, less than -1) don't align with the concept of randomization distribution under the null hypothesis.

Answer:

The distribution mean will be close to zero.