Question

Ruling Out Chance Quick Check
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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)
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 less than −1.
The distribution mean will be less than negative 1 .

The distribution mean will be close to zero.
The distribution mean will be close to zero.
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Answer 1

When treatment groups are re-sorted repeatedly using random assignment to create a randomization distribution, the mean of the distribution will be close to zero. This is because, under the null hypothesis (which typically states that there is no effect or no difference between groups), the expected value of the differences in groups should average out to zero.

So the correct response is:

**The distribution mean will be close to zero.**