Exam 2 - Stat Process Control Flashcards Preview

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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

When Variation observed and due to a problem or the chart is out of control, you should ----4 steps

Stop, identify cause , adjust, and restart