Critical Threat?

[nibelung]

i know this is a stupid question, but i never played PnP and the descriptions are pretty vague

with a falchion it says crit on 18-20, so with improved critical would it be 15-20? and with exalted smite 4, smites would crit 13-20? or is this wrong

[AylinIsAwesome]

That is correct.