I'd have to sit down and work out the math.
That said, no - at least not in the way our handsets measure signal strength (aka, bars, in absolute signal, yes), a 3db change would be enough to change a place from a place where voice calls may not work at all, or unreliably to a place where voice calls work quite reliably. It will turn the marginal and fringe into more reliable spots.
I believe that most of the problems we experience are backhaul, not RAN related. NV replaces the problematic backhaul, in the places where NV has rolled out, I've seen a great improvement in call stability and data speeds, even when I cant get LTE.