The upper control limit for X bar chart is given by _______ (a) X bar + A2R bar

Question

The upper control limit for \(\overline{X}\) chart is given by _______

(a) \(\overline{X}\) + A₂\(\overline{R}\)

(b) \(\overset {=}{X}\) + A₂R

(c) \(\overset {=}{X}\) + A₂\(\overline{R}\)

(d) \(\overset {=}{X}\) + A₂\(\overset {=}{R}\)

Answer 1

 (c) \(\overset {=}{X}\) + A₂\(\overline{R}\)