Midterm 1

Midterm 1 - Spring 08 IE 330: Industrial Quality Control...

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Spring 08 IE 330: Industrial Quality Control 2/20/08 Midterm Test 1 Part 1 (50 pts) 1) (3 pts each) For each of the following statements indicate whether it is tru or false a. What made Deming recognized for the first time in the US was his first book “ Out of the Crisis ”. F b. One of the case studies assigned in the first HW was a case in a medical center. T c. According to Deming, variation in a process is normal. T d. In general, consecutive sampling is more preferable to distributed sampling. T e. Special causes are usually correctable locally. T f. Including zone tests in interpreting control charts increases the type I error. T 2) (6 pts each) Charts for the following data with n = 4 exhibit statistical control: X R UCL 705 18.08 CL 700 7.979 LCL 695 0 a. Estimate μ and σ. Solution: μ=700 σ=7.979/d2=7.979/2.059=3.875 b. Estimate the fraction not conforming if the process output is normally distributed and the specification is 705 ± 10. { } { } 0005 . 0 08 . 0 87 . 3 29 . 1 875 . 3 700 715 875 . 3 700 695 } 715 { } 695 { + = + - < = - + - < = < + Z P Z P Z P Z P X P X P c. For the x chart, find Pr{ type I error } if σ is constant. Assume that the
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Midterm 1 - Spring 08 IE 330: Industrial Quality Control...

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