What is the formula for UCL for x bar chart when s is known?
Posted: Thu Jul 14, 2022 1:47 pm
a) \(UCL = \bar{\bar{x}} + A_3 \bar{s}\)
b) \(UCL = \bar{\bar{x}} – A_2 \bar{s}\)
c) \(UCL = \bar{\bar{x}} – A_3 \bar{s}\)
d) \(UCL = \bar{\bar{x}} + A_2 \bar{s}\)
b) \(UCL = \bar{\bar{x}} – A_2 \bar{s}\)
c) \(UCL = \bar{\bar{x}} – A_3 \bar{s}\)
d) \(UCL = \bar{\bar{x}} + A_2 \bar{s}\)