IE330, HW#4
Consecutive sampling reduces the opportunity for the occurrence of special causes within the subgroup because the amount of process evolving over the time of subgroupcollection is reduced. Moreover, it can capture the abrupt mean shifts
IE330, HW#3
t 2 , n -1
x - x sx
t 1 - 2 , n - 1 20 . 44 x 21 . 54
Since the hypothesized mean shaft diameter of 20.5 mm falls within the 95% confidence interval, manufacturer's claim cannot be rejected.
Spring 08
IE 330: Industrial Quality Control Midterm Test 1
2/20/08
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
Name:
IE 330 Midterm # 2 Questions Spring 2008 04/02/08 Prof. Tolga Tezcan
PART 1: Answer all the questions 1thorugh 4 Question 1 (10 pts) The following table gives ARL performance, that is; expected number of samples before the charts give an out
IE 330 Industrial Quality Control
Lecture 6: Chapter 5 Conceptual framework for SPC
Key Concepts
1.
2.
Sources of Variation and Their Control Measure Manufacturing Field Use Process Behavior Over Time Building Statistical Models/Assumptions Con
IE 330 Industrial Quality Control
Lecture 4: A quick review of concepts in probability and statistics 1/28/2008
Binomial Distribution
Assume that we produce fair coins We need to make sure they are really fair Take 10 samples every 30 minutes
I
IE 330
Lecture 3
Chapter 2 cont’d
1/23/08
Deming’s point 6
• Better Training
• for someone to know how to do something well, they must be
trained properly
• People, not information, are an organization's most important asset.
• “greatest waste in America
IE 330 Lecture 5
Chapter 3 cont'd 1/30/08
The need of "Statistical Inference"
In statistical quality control, the probability distribution is used to model some quality characteristic. The parameters of a probability distribution are unknown.
Process Capability Assessment
IE 330: Lecture 10 2/11/2008
First midterm and other issues
Midterm 1, a week from today Covers lecture notes 1-10 (includes today) Sample test posted Workshop 1 is also due next week HW 5: study problems and assign
Control Chart
Methods for Individual
Measurements
IE 330: Lecture 9
2/11/2008
Outline
Why not sample more?
Shewart type charts
Example:
White millbase dispersion process
Exponentially weighted moving average
control charts
Why not sample more? (n=1)