Which statement is the best example of a hypothesis? 1. There is no relationship between fatigue and reaction time. 2. Sugar consumption is not related to level of activity. 3. Smaller class size is related to better academic performance. 4. Self-esteem does not affect persistence on a difficult task.

The answer is statement 3: Smaller class size is related to better academic performance

Explanation:

An hypothesis is an assumption taken to be true for the purpose of investigation.

Unlike statement 3, the statements 1, 2 and 4 are more like facts, since they are definite.

Thus, statement 3 tells of an assumption, and is an hypothesis