i dont think it was "SPEECH" in the fallout universe* but charisma.
I mean what was S P E C I A L stand for again?
let me check...
S trength
P erception
E ndurance
C harisma
I ntelligence
A gility
L uck
Yea, you might need to change that ^^; (hey i play fallout, judge me XD)
*edit: i did play literally every fallout game.
Fallout 1
Fallout 2
Fallout tac.
Fallout BOS (we dont talk about this one...)
Fallout 3 + GOTY
Fallout N.V.
Fallout 76
the only one i skiped was Fallout 4 tbh (but i watched my bro playing it).
"Speech" was a thing only and only in 1, 2, 3 Vegas, somewhat - even there its based on charisma everywhere else its a charisma (+ Luck) thing and works 100%.
And even if we go with the classic "speech" check, those are based on %. From Fallout 3/N.V., they would work similar.
For everyone who reacted dumb: look it up.