Statistical P S i i l Process Control C l 26 August 2009 University Malaysia Perlis P li Presented by Dr Zaharah Wahid DRZ CONSULTANT 1 An Overview of Statistical Process Control (SPC) DRZ CONSULTANT 2 What is SPC Statistical : A universal language to describe and analyse the physical variability of a process. Process : The transformation of inputs including f f man‚ machinery‚ methods‚ materials‚ energy and information to attain a desired result result. Control : To make a process behave
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PROBLEMS 2. Control charts for X and R are to be established on a certain dimension part‚ measured in millimeters. Data were collected in subgroup sizes of 6 and are given below. Determine the trial central line and control limits. Assume assignable causes and revise the central line and limits. |SUBGROUP NUMBER |Xbar |R |SUBGROUP NUMBER |Xbar |R | | |20.35 |0.34
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Control Charts Control Charts are use to distinguishes between specialcause or common-cause of variation that is present in a process. There are two basic types of control charts:- Variables - Quantitative data (Measured) Attributes - Qualitative data (Counted) Variable Control Charts Use actual measurements for charting Types:- Average & Range charts Median & Range charts Average & Standard deviation charts Individual & Moving Range charts Run Charts Attribute
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Control Charts Control charts‚ also known as Shewhart charts are tools used to determine if a manufacturing or business process is in a state of statistical control. The control chart was invented by Walter A. Shewhart‚ (also known as the father of statistical quality control) while working for Bell Labs in the 1920s. The company’s engineers were seeking to improve the reliability of their telephony transmission systems. The engineers had realized the importance of reducing variation in a manufacturing
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complete? Answer: 0.0301% Reasoning/Work: from my understanding I subtracted 1.8 from 1.88 which is my answer = .08 then I found the answer on the table b. What percentage of the rooms will take more than 21.0 min to complete? Answer: 0 % Reasoning/Work: the answer is 0. c. What percentage of the rooms will take between 12.0 and 20.5 min to complete? Answer: 0.97% Reasoning/Work: I found the a of the 2 possibilities then I subtracted the smaller a from the bigger a. 2: In this question
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CONTROL CHARTS FOR VARIABLES TUTORIAL 4 : CONTROL CHARTS FOR VARIABLES 1. Control charts for X and R are to be established on a certain dimension part‚ measured in millimeters. Data were collected in subgroup sizes of 6 and are given below. Determine the trial central line and control limits. Assume assignable causes and revise the central line and control limits. SUBGROUP NUMBER 1 2 3 4 5 6 7 8 9 10 11 12 13 X 20.35 20.40 20.36 20.65 20.20 20.40 20.43 20.37 20.48 20.42 20.39 20.38 20.40
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Basic Tools for Process Improvement Module 10 CONTROL CHART CONTROL CHART 1 Basic Tools for Process Improvement What is a Control Chart? A control chart is a statistical tool used to distinguish between variation in a process resulting from common causes and variation resulting from special causes. It presents a graphic display of process stability or instability over time (Viewgraph 1). Every process has variation. Some variation may be the result of causes which are not normally
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The KSB Organizational chart in the transition phase A-Note 1. The Transition (September 14- December 14 2013) phase is definite period of time with a definite agenda to be done by a definite staff or volunteer bodies 2. The RESULT: 2.1 the SGA revolution were implemented with a management team and the transition organizational chart of officer operating the KSB. The REHAB plan formulated 2.2 Restored juridical
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Jennifer Purifoy April 30‚ 2001 Page 1 of 3 Executive Summary for The Goal: A Process of Ongoing Improvement by Eliyahu M. Goldratt The heart of this story is based around the life of Alex Rogo‚ Plant Manager for Uniware a division of Unico. After a very upset customer approaches Alex’s boss‚ Bill Peach‚ he is given an ultimatum to turn the plant around in three months. Due to the limited amount of time available‚ there are not many outside tools available such as consultants‚ surveys‚
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Assignment (Prof. Kripa Shanker) Books on decision making or operation research The Goal: A Process of Ongoing Improvement by Eliyahu M. Goldratt‚ Jeff Cox and David Whitford (Jun 2012) Operations Management (Operations and Decision Sciences) by William Stevenson Project Management wMSProject2007 CD and Student CD by Erik Larson and Clifford Gray Statistical Techniques in Business and Economics (Mcgraw-Hill/Irwin Series Operations and Decision Sciences) by Douglas Lind‚ William Marchal
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