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

question 3

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 lower control limit for her $\bar { x }$ chart is ____.

• A)25.913
• B)4.913
• C)111.91
• D)108.10
• E)112.84

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