Final answer:
The more negative the reduction potential, the stronger the reducing agent. This indicates a greater tendency to lose electrons and reduce other substances.
Step-by-step explanation:
The reduction potential is a measure of the tendency of a chemical species to acquire electrons and thereby be reduced. The more negative the reduction potential, the stronger the species is as a reducing agent. This is because a more negative reduction potential indicates a greater tendency to lose electrons and reduce another substance.
When considering substances like permanganate, dichromate, and titanium dioxide, the one with the largest reduction potential (in this case, permanganate) is the strongest oxidizer, while the one with the smallest or most negative reduction potential would be the strongest reducing agent.