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 inches,and mean of the 26 ranges is 0.15 inch.The centerline for her chart is _________.
A) 5
B) 26
C) 0.15
D) 11.2
E) 112

Question

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 inches,and mean of the 26 ranges is 0.15 inch.The centerline for her  chart is _________.
A) 5 
B) 26 
C) 0.15 
D) 11.2 
E) 112

Quizplus · Accepted Answer

The centerline for the ª chart is the mean of the sample means, which is given as 112 inches.

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