IEOR 165 Lecture 14 June 24 2009

IEOR 165 Lecture 14 June 24 2009 - Quality Control Ratings...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Quality Control Ratings are mostly based on the quality of, for instance, cars. Lemming, a statistician, proposed Quality Control and in the 60s, there wasn’t really a concern for quality in the US. People were more concerned with the look/comfort. The Japanese took into high consideration, Lemming’s ideas. (2) Second step: Define Acceptable variability/specification UPL LPL (upper/lower process limit) USL LSL (upper/lower specification limit) N(mean, variance) measurement Target mean μ0 LSL μ μ0 USL (3) Step 3: Center the process to the target If the difference between LSL and USL is large, then my customer doesn’t care what he/she gets and we don’t need to care about quality. But if the difference is small, then we need to spend more time with quality control. Process capability: = - cp USL LSL6σ If the process is centered, the Cp (process capability) immediately reveals their defectives per million items produced (Dpm)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
LSL= - μ 3σ USL= + μ 3σ = μ μ0 Suppose Cp=1; Dpm=2700
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/22/2009 for the course IEOR 165 taught by Professor Shanthikumar during the Summer '08 term at University of California, Berkeley.

Page1 / 5

IEOR 165 Lecture 14 June 24 2009 - Quality Control Ratings...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online