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joe studied his control chart and notice it had been built with repeated samples if 10...

joe studied his control chart and notice it had been built with repeated samples if 10 units and three sigma limits that were ucl 109.0125 and lcl 90.9875 what is process stardard vdeviation? 9.5 6.7
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Answer #1

confidence interval is                  
lower limit =    90.9875              
upper limit=   109.0125              

margin of error = (upper limit-lower limit)/2= (   109.0125   -   90.9875   ) / 2 =   9.0125

margin of error ,E = 3*σ/√n = 9.0125

σ = 9.0125*√10 /3 = 9.5 (answer)

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