Engineering Board Exam Reviewer · Engineering Management · hard
A p-chart uses samples of 100 items, and the average fraction defective is 0.04. What is the upper control limit?
- 0.1000
- 0.0988
- 0.0792
- 0.1552
Answer
B. 0.0988
Solution
p = sqrt(p(1 - p)/n) = sqrt(0.04 × 0.96/100) = 0.0196. UCL = 0.04 + 3(0.0196) = 0.0988. (LCL = 0.)
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