Sarah Soliz,Director of Quality Programs,is designing and R charts for the rod shearing process at Stockton Steel.She has 26 samples of rod length,and each sample included measurements of 5 rods.The mean of the 26 sample means is 112 centimetres,and mean of the 26 ranges is 0.15 centimetres.The lower control limit for her R chart is ___.
A)0.150
B)0.000
C)0.317
D)2.114
E)1.000

Question

Quizplus · Accepted Answer

The lower control limit (LCL) for an R chart is calculated using the formula LCL = D3 * R-bar. For a sample size of 5, D3 is 0, so the LCL is 0.

Sarah Soliz,Director of Quality Programs,is Designing and R Charts for the Rod