Question

which of the following is not true about an experimental investigation? it always includes a control group it is considered a “fair experiment” it includes independent and dependent variables it always supports a hypothesis

Explanation:

An experimental investigation doesn't always support a hypothesis. Results can either support, reject, or be inconclusive regarding the hypothesis. A control group is often present to make comparisons, it is a fair experiment with proper variable - control, and includes independent and dependent variables.

Answer:

It always supports a hypothesis