Flashcards in Exam 2 - Stat Process Control Deck (12):

0

## The goal of statistical process control is to

### Make a process stable over time and then keep it stable unless planned changes are made

1

## All processes have variation, to monitor variation we ....

### Measure characteristics of process input and output

2

## Control chart is a

### Statistical tool for monitoring an input or an output of a process that had variation, alerting us when problem has occurred

3

## Process is a sequence

### Of operations used in production, manufacturing

4

## Process IN statistical control

### A process whose input s and outputs exhibit natural variation when observed over time

5

## Caution: a process in control does not guarantee

### Good quality

6

##
Construction of control chart

1. Draw...

2. Draw

3. Plot the

###
1. Draw a horizontal line at mu

2. Draw horizontal control limits at mu+- 3sigma/square root of n

3. Plot the means (x- bars) from the samples of size n against time

7

## Out of control signals - 2

###
One point above or below UCL

Run of 9 points in a row on the same side of the centerline

8

## If out of control signal observed, ..... The process and look for a cause

### Stop

9

## T/F we expect natural variations around our target value on the control chart

### True

10

## Natural variation

### Ordinary or expected

11