Issuing a denial on a supposed crime, or felony, does not necessarily mean that the person is actually denying his/her implication in a crime, or being guilty of it, but it can come from the person´s knowledge that unless there is an open admittance of guilt, an open confession without duress, a person will not be found guilty until the parts prove otherwise. What does give a suspect added confidence, more than a denial, is the knowledge that he/she is considered innocent until proven guilty.
I believe the answer is false. There are many more factors that go into determining whether a suspect is guilty or innocent during an interrogation. Spoken denials may not convince the interrogator.