during which step of the scientific method does a scientist make an educated guess about the outcome of an experiment

hypothesis statement or the very beginning.

The answer is Hypothesis

Explanation:

To perform a scientific method, first the scientist must (1) observe an event of the environment, then, he goes on to the (2) introduction where the observed is analyzed and a question is generated, about the "Why?" of the facts. It is here that the scientist happens to make a supposition known as (3) hypothesis, which must be (4) experienced and (5) demonstrated to finally obtain (6) conclusions about it.