Question

For the bar, R, and S table provided below, calculate the Z1, Z2, Z3, W1, W2, W3, and central line of W and Z bar chart and control limits. Target grand average (X-double bar) is 7.0 and target R-bar is 0.25.

sub1 sub2 sub3

Xbar 7.020 7.080 7.000

R 0.300 0.500 0.300

S 0.130 0.205 0.1224

Answer 1