Sarah Soliz, Director of Quality Programs, Is Designing $\bar { x }$

question 14

Multiple Choice

Sarah Soliz, Director of Quality Programs, is designing $\bar { x }$ 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 R chart is ____.

• A)0.15
• B)26
• C)5
• D)112
• E)15

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