Chapter 13 Statistical quality control

Question 1

deviation in the output of a process that can be clearly identified and managed

Answer 1

assignable variation

Question 2

deviation in the output ofa. process that is random and inherent in the process itself

Answer 2

common variation

Question 3

the range of values in a measure associated with a process that is allowable givent he intended use of the product or service

Answer 3

upper and lower specification limits

Question 4

as variation is reduced, quality is ______

Answer 4

improved

Question 5

quality characteristics that are measured in actual weight, vilume, inches, centimeters, or other measure

Answer 5

variables

Question 6

quality characteristics that are classified as either conforming or not conforming to specification

Answer 6

attributes

Question 7

techniques for testing a random sample of output from a process to determine whether the process is producing items within a prescribed range

Answer 7

statistical process control (SPC)

Question 8

standard _____ _____ have a center line and upper/lower control limits. these are specific to the data type being observed

Answer 8

control charts

Question 9

• uses x-bar and r-charts
• used to monitor both the average (mean) and variation (range) of a process over time by plotting the average subgroups on one chart and the range of each subgroup on a seperate chart

Answer 9

variable data (continuous)

Question 10

• uses p-charts (% of defects)
• to monitor the proportin of defective items in a process

Answer 10

attribute data (discrete)

Question 11

a process that appears to be performing as expected is said to be

Answer 11

in control or stable

Question 12

incorrectly concludes “in control “

Answer 12

type 2 error

Question 13

when we incorrectly conclude a process to be “out of control”

Answer 13

type 1 error