GG
Answered
An operator trainee is attempting to monitor a filling process that has an overall average of 705 cc. The average range is 17 cc. If you use a sample size of 6, what are the upper and lower control limits for the x-bar and R chart?
On May 24, 2024
From table, A2 = 0.483, D4 = 2.004, D3 = 0
UCL xˉ\bar xxˉ = xˉ\bar xxˉ + A2 ∗ Rˉ\bar RRˉ LCL xˉ\bar xxˉ = xˉ\bar xxˉ - A2 ∗ Rˉ\bar RRˉ UCLR = D4 ∗ Rˉ\bar RRˉ = 705 + 0.483 × 17 = 705 - 0.483 ∗ 17 = 2.004 ∗ 17
= 713.211 = 696.789 = 34.068
LCLR = D3 ∗ Rˉ\bar RRˉ = 0 ∗ 17
= 0